Tomatoes are generally easy*, but need watering. I successfully grew carrots, radishes & lettuces when I was 7 or 8, & my grandfather gave me a corner of his garden (rural council house - huge garden, because they expected us rural proles to grow our own veg).
Currants are easy (stick bush in ground: go away for a couple of years), but need protecting from birds. They'll munch the buds if allowed to. Gooseberries are a doddle. Rhubarb just needs some well-fertilised ground, then can be left to get on with it. A small sunny patch can provide you with all the herbs you're likely to want. Basically, what Pancho said. The main thin is to plant stuff at the right time. Some things are best planted under cover to start with (I've had tomato seedlings killed by hail when Mrs B forgot to bring in a tray she'd put outside to get the early spring sunshine), some things need protection from birds, insects or diseases, some things need feeding, or plenty of water, some need physical support - but even if you get it wrong, a lot of 'em will struggle through anyway, albeit with reduced yields. I'm strongly in favour of benign neglect. It works pretty well for me.
Oh yes, and compost. You can never have too much compost. Get a big enough heap (but it does need to be BIG), & it'll get hot enough to kill weed seeds. Compost everything you can: kitchen paper, peelings, the works. Macerate woody stuff & as long as you have enough other stuff to mix in with it, it'll rot. Wool composts, as do nail clippings. If you have enough material, have a "clean" compost heap/bin (I prefer bins) & a "dirty" one, in which you put stuff you don't want on your food. Use the "dirty" compost for fruit bushes, flowers, & the clean one for anything you eat that touches the soil, e.g. root vegetables, & especially salad.
Have you considered chickens? You have plenty of room. A movable chicken house, with a wire enclosure which can be moved with the house, would enable you to shift 'em around, which I think is best, when you have room to do so. They de-weed a patch of ground very thoroughly indeed (& enjoy doing it! A pleasure to watch 'em start in on a fresh weed patch, clucking excitedly), converting the weeds into Grade A fertiliser (mostly deposited in the soil, & any excess is an excellent addition to your compost) & eggs. Last years chicken run is this years tremendously fertile vegetable patch. They also turn kitchen scraps & leftovers into fertiliser & eggs. And they taste pretty good.
*Which reminds me: mine are still ripening out there! I'm still giving away the surplus.
[Edit] I'm with Pancho on raised beds. You end up spending more than the value of the vegetables on filling your garden with timber & so on. IMO it's a lot of work to save a bit of work, it's a waste of money, it ain't green, & it makes a vegetable garden look like one of those architectural, "house moved outside", gardens. I reckon they're a ploy by garden centres to sell more stuff, like decking.