Welcome to the world of bikes Brightwild. What are you getting? I've been a motorcyclist since I was 17 which is certainly more than 50 years ago
Oops, of course this is a smallholding forum
so welcome to the growing world, you'll love it.
I'm not totally convinced about growing in raised beds, but as you have a disability then it could be best for you to do that. My advice is not to invest in 'compost' to fill your beds but get proper vegetable garden soil, which you can get delivered in bulk I tonne bags or normal sized sacks, but you will need a lot of those. What is sold as 'compost' is currently fairly rubbish with little nutrition and little structure, and is very different to home made garden compost which is the bizz! Best of all is to use your own garden soil and improve it with well rotted farmyard manure or horse manure (usually easily sourced at local stables), building it up over the years.
To make your own compost, most people today either build a 4 foot square bin or two from wood, or buy one or two commercial bins such as 'daleks', whichever will be easiest for you to manage. To make compost, you can go many routes, from total obsession with browns, greens, moisture levels, additives, to 'chuck anything suitable in and it will eventually turn into useable compost' at the other end of the spectrum. There is so much info available in books and on youtube channels to watch and choose your favourite. Growing veg in raised beds is the current fashion so there's lots written and pictured about that too. Charles Dowding is a good place to start but there are plenty of others.
I love that you're going for a wildlife area and you can also grow a few flowers amongst the veg to help diversity and to attract bees and other insects to your veg for pollination.
I'm a believer in understanding what you are doing before you start, so I recommend getting the kind of veg growing book which lays out your year for you, with what to do when. You are lucky to be in the south as growing is relatively simple in the warmer climate in the south of the UK.
Good luck with your exciting new venture (don't wear yourself out by trying to do everything at once, start out gently)