I know, I love the wall, I would love to get some wall flowers in there, but I'm not too sure how to go about doing it.
Have you got pictures of your patio apple trees? It's the best option for me to make sure it'll have enough sun. Also, do you need more than one tree for pollination?
Really lovely garden Katie, bet you are excited to get cracking Nice area beside your extension too Like the others I especially love the wall. Def would paint the shed and widen the borders, perfect time to do that,get all your bulbs in the ground and then the best bits, choosing your plants I look forward to what you choose
Have a look at our garden gallery thread and see other members gardens too as plenty of ideas to inspire you and copy
What direction does the wall face Katie? That's important when you choose plants. If there are good little holes there it's quite easy and it can look tremendous. We had a large wall at last house which supported the terrace above it. Very neglected, but a good clean up and some new plants and it looked totally different. It was south west facing so I used dark red sempervivums, small shocking pink geraniums and white trailing dianthus and repeat planted those. There were lots of little self seeded ferns already there which I left as well. I initially put in some lovely dark ajuga but I knew it probably would be far too dry for it, which it was, so I had to replace those. I pushed the plants in with a bit of compost and then used chicken wire squashed in to hold them in place.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
I'm no designer so can only give ideas rather than advice - but i'd work out what you want. Entertaining? flowers? future play area? veg?
Also think about height and using the walls and fences to provide extra space. I've used gutting on a fence for strawberries - small planters (12inches square) for beans and herbs, hanging baskets for trailing tomatoes and flowers.
I'd widen the borders for flowers and a few veg, climbers on the fence and walls. You can have apple trees trained on the fence (and other fruit). I also found in a small garden if you keep the grass cut and edges of any borders neat and crisp - the whole garden looks 100 times better.
Terracotta pots would look good. Clean the slabs if you keep them. Loose the washing umbrella thing - get a retractable line. Looking at the fence and walls - looks like a shaded and sheltered area - you might want to consider woodland type plants. And a small pond! My kids loved the veg - and the pond. You don't need to go self sufficient just half a dozen pea plants and a planter with a few carrots is fantastic for kids. I had a trough with carrots, fennel, herbs, beetroot, parsnips. Great fun. That's probably everything I can think off!
The washing line is going and we're going to get a retractable one to go across the garden. The wall is North facing and the garden is very shady.
I bought a japanese maple today which I am just planting now. Its hard work as all I have is a trowel at the moment. So its taking ages. I'm planning out where to put the bulbs, and when I have a shovel I'll beginning widening the border. Along the wall I'm going to widen to 1m, and along the fence to 50cm as I don't want to lose too much of the lawn.
It's so hard to pick plants and try and think about what they're going to look like when they are big. I think a lot of research and planning is going to happen over winter. For now, widening the border, planting my tree and getting the bulbs in are the main jobs. Anything else I should do before winter?
Also, if anyone else has any ideas, I'd really appreciate them The ideas so far have been fantastic, thanks everyone!!
Just seen your update and felt so sorry for you digging big hole with trowel Could your neighbour or family or friends lend you a spade till you get one? What type of acer did you get and where have you put it? lovely first purchase and hope you're pleased What bulbs did you get? I'm glad you think it's good idea to widen your borders I understand you do not want to loseatop much lawn so was thinking why not do the border in front of fence to a metre and the wall border the 50cms? I think that way round would feel more balanced as you look up the garden? But maybe that's just me!
Hi Katie, it looks as though you have a similar size garden to mine! Ours is quite sunny though so we will end up with a different approach. We have a little one to think about already so a lawn is important to us. We also like to dine outside as often in the summer so we created a deck outside our patio doors. I'm a long way from completion yet though and have had a bit of a creative block at the moment. Best thing is to draw many different ideas out and try to imagine what they might look like.
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FG, as a muralist I have to say I'm a bit hooked on walls
art
I live in west central Scotland - not where that photo is...
I know, I love the wall, I would love to get some wall flowers in there, but I'm not too sure how to go about doing it.
Have you got pictures of your patio apple trees? It's the best option for me to make sure it'll have enough sun. Also, do you need more than one tree for pollination?
Really lovely garden Katie, bet you are excited to get cracking
Nice area beside your extension too 
Like the others I especially love the wall. Def would paint the shed and widen the borders, perfect time to do that,get all your bulbs in the ground and then the best bits, choosing your plants 
I look forward to what you choose 
Have a look at our garden gallery thread and see other members gardens too as plenty of ideas to inspire you and copy
Monty made it look easy on his new programme Wednesday night, big dreams, it's on I player x
The wall planting that is
What direction does the wall face Katie? That's important when you choose plants. If there are good little holes there it's quite easy and it can look tremendous. We had a large wall at last house which supported the terrace above it. Very neglected, but a good clean up and some new plants and it looked totally different. It was south west facing so I used dark red sempervivums, small shocking pink geraniums and white trailing dianthus and repeat planted those. There were lots of little self seeded ferns already there which I left as well. I initially put in some lovely dark ajuga but I knew it probably would be far too dry for it, which it was, so I had to replace those. I pushed the plants in with a bit of compost and then used chicken wire squashed in to hold them in place.
I live in west central Scotland - not where that photo is...
I'm no designer so can only give ideas rather than advice - but i'd work out what you want. Entertaining? flowers? future play area? veg?
Also think about height and using the walls and fences to provide extra space. I've used gutting on a fence for strawberries - small planters (12inches square) for beans and herbs, hanging baskets for trailing tomatoes and flowers.
I'd widen the borders for flowers and a few veg, climbers on the fence and walls. You can have apple trees trained on the fence (and other fruit). I also found in a small garden if you keep the grass cut and edges of any borders neat and crisp - the whole garden looks 100 times better.
Terracotta pots would look good. Clean the slabs if you keep them. Loose the washing umbrella thing - get a retractable line. Looking at the fence and walls - looks like a shaded and sheltered area - you might want to consider woodland type plants. And a small pond! My kids loved the veg - and the pond. You don't need to go self sufficient just half a dozen pea plants and a planter with a few carrots is fantastic for kids. I had a trough with carrots, fennel, herbs, beetroot, parsnips. Great fun. That's probably everything I can think off!
The washing line is going and we're going to get a retractable one to go across the garden. The wall is North facing and the garden is very shady.
I bought a japanese maple today which I am just planting now. Its hard work as all I have is a trowel at the moment. So its taking ages. I'm planning out where to put the bulbs, and when I have a shovel I'll beginning widening the border. Along the wall I'm going to widen to 1m, and along the fence to 50cm as I don't want to lose too much of the lawn.
It's so hard to pick plants and try and think about what they're going to look like when they are big. I think a lot of research and planning is going to happen over winter. For now, widening the border, planting my tree and getting the bulbs in are the main jobs. Anything else I should do before winter?
Also, if anyone else has any ideas, I'd really appreciate them
The ideas so far have been fantastic, thanks everyone!! 
Hi Katie
Just seen your update and felt so sorry for you digging big hole with trowel
Could your neighbour or family or friends lend you a spade till you get one? What type of acer did you get and where have you put it? lovely first purchase and hope you're pleased 
What bulbs did you get? I'm glad you think it's good idea to widen your borders 
I understand you do not want to loseatop much lawn so was thinking why not do the border in front of fence to a metre and the wall border the 50cms? I think that way round would feel more balanced as you look up the garden? But maybe that's just me! 
Hi Katie, it looks as though you have a similar size garden to mine! Ours is quite sunny though so we will end up with a different approach. We have a little one to think about already so a lawn is important to us. We also like to dine outside as often in the summer so we created a deck outside our patio doors. I'm a long way from completion yet though and have had a bit of a creative block at the moment. Best thing is to draw many different ideas out and try to imagine what they might look like.