I was a complete novice 3 years ago, had only grown cress in an egg shell… however bought a house with raised vegetable beds and immaculate landscaping ( not as immaculate now).
Start with the easy stuff, tomatoes you can start growing from seed on a sunny windowsill inside now, depending on what your soil is like, you can after frosts have finished plant into grow bags or directly into your soil with canes to support them. I started with spring onions ( we like them in potato salads) they can take a while to germinate but are happy in larger pots.
Companion planting tomatoes with basil is a good idea, the basil can help deter pests to the tomatoes ( my first year crop were wiped out due to evil bugs :) )
Think about your soil, you may need to spend a little on decent compost and soil enhancers in the first year. Start to compost your own vegetable kitchen waste - save banana skins, cut the skins up and put in plastic containers with water to use as a potassium rich fertiliser - fertilisers can be expensive so making your own makes sense. I use plastic milk containers.
I also grow courgettes ( half my street also have my courgettes) again after frost they will happily grow. And are fairly fast to germinate
Also worth planting some sunflowers and violas to encourage bees and other pollinators, plus they are cheerful ( I grow my stuff from seed but am in Nz and remember that the uk climate is very different).
I grow from seed, a seed catalogue company would give you good ideas about what should be planted when, but I do know in a warm windowsill you can start tomato seeds on New Year’s Day.
I hope you enjoy it, I think it’s very rewarding ( am experimenting with butternut squash this year) . Am sure someone with far more more expertise will come along ….