I grow my own veg every year, the only other bits i do are my hanging baskets as I am a veg girl, love getting all that almost free veg.
courgettess, 1 or 2 plants , (1 per large pot as they get big) will give you loads of veg all summer
Carrots, spring onions, radish (if you like them, bit spicy for me)
Onions, lettece, toms , peppers (likes as much warmth as possible) - we have one that was late last year and so put in pot on window when it got cold as a shame to let the winter get it, and have had spicy red peppers all winter, and he has just gone back out to patio again, how long it will go on for - not sure!
Peas, climbing french beans with canes in pots are very tall and take no floor space, and lots herbs like oregano for pasta.
Get some rasberry or blackcurrent canes, goosberrys etc I just put min in the garden this year after about 6 years in pots and they fruited loads, for Jam and puddings and my freezer is still full of them f.or crumbles and stewed fruit. My kids like rasberry smashes on ice cream , (frozen raberrys, smashed after frozen with a rolling pin into tiny peices).
As a warning , you can get frosts upto end may, so be careful when putting outside yet, it's a gamble , last year I went early and it paid off, but could have lost them all , this year got one of those small plastic pretend greeenhouse things to protect them really if you can or use or make a cold frame.
So exciting - I love spring !