I had this same problem when my Mum (chef extroadinaire) moved out of the flat, leaving me with no skills and no ideas whatsoever. That was two months ago now, so hopefully this will fit the mentality you might have, if it's anything like mine was. In other words, the need to eat enough to be healthy while not really having to learn how to do anything, and preferrably sorted with minimal effort.

Pasta meals. Look for such things as raviolli and tortellini (or something like that), and buy a stir-in sauce with it. Easy meal. Not sure if you have them over there, but that's basically what I survive on. 40% 2-minute noodles, 40% tortellini, 20% the rest of the stuff you're about to read below. Tortellini/raviollie are kinda like cheese/meat stuff wrapped up in pasta. Like wontons only not crunchy, and you put them in pasta sauce and they taste gooood.

Eggs. Put them in boiling water on the stove and cook for 3-8 minutes depending on how soft/hard boiled you want them.

Potatoes. Easy enough to cook, just throw them into the water (well, clean the spuds) and leave them in there until they're ready. The smaller you cut them, the less cooking time. You get the hang of how long to cook them pretty quickly, you just test them by stabbing them with a fork or something.

Carrots - uncooked, just make sure you have a potato peeling thingy.

Mixed veges are the ultimate solution to your vegetable needs. A true godsend for peopel like me. Corn/peas/peppers/beans/carrot/broccoli. So long as it has at least three of those, you should be okay.

Make sure you still have some milk at some point. I don't have cereal, so I have to make a mental effort to go out and buy some milk every now and then. Milk goes well with Nestle Rolos.

Breadcrumbed fish/chicken. Make sure you're not getting ripped off, but yeah. Chicken kievs are really nice, dunno if you have them over there. Those are the only chicken things I really buy. They're like a breadcrumbed chicken meal with stuff in the middle, like ham and cheese or garlic and chives or some kind of spicey stuff. Nice, and easy to cook. Instructions are on the packets and so long as you have some kind of timer (or are more capable of keeping up with the overn than I am), you should be fine.

Cup'a'soup. Cheap and satisfying. If you find the right one, anyway.

Sandwiches.

Small pre-made salads. Just eat them the night you buy them - they go off pretty fast.

Fruit - apples and bananas.

That pretty much summarises my at-home diet. At work I have a sausage and egg roll for breakfast and a random sandwich/bread roll for lunch, with some chips and a fruit drink.

Hope that helps, from one half-arsed slacker living by himself to another.