What kind of plants did they put in your front garden?Oh and re: bulbs, I saw some reduced alliums in morrisons for £1 (down from £2), might be worth a look.
The thing with asking such a question is you will get a lot of good suggestions - which is great - but I would compile a list of things you want from "your" garden. eg.. How much time will you spend in it?... will you actually do any "gardening"?Do you want to entertain or will it be a private space you can relax in?Will it be used by pets or kids?What style of garden do you like?Whats your budget?Give yourself 6 to 8 months to think about what you'd prefer.. have a walk around the local area to see what grows well & perhaps talk to neighbours with established gardens?In that time note how wet or dry it becomes & see where the light falls.I would be chomping at the bit to get going too but try and resist so whatever you decide wont disappoint you later on (or waste time & money).
I would deep some deep holes and see what the ground is made of - if you have much topsoil, how it drains. The nature of the ground may well determine what you do with it.
You will have a lot of soil improvement to do in the future...amazing how the developers are allowed to do this. It's not a sustainable depth for long-term gardening.