Best fertilizer

I moved into a house at the back end of last year and the garden was just grass, I've started digging out borders and adding plants but I would like to get some nutrients in the ground. What's the best thing to use? A layer of fresh compost, fish blood and bone or other types of fertilizer?
Thank you
Thank you
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If you're near stables, and can get there on foot with a wheelbarrow, that's another option for the manure
I live in west central Scotland - not where that photo is...
If I got FBB any tips on mixing it in as I have Herbaceous plants in there so I don't want to end up digging into them