The great thing about being at home is that you can do things like soups that aren't complicated but take longer for cooking. I can highly recommend the Daily Soup Cookbook (it's just a paperback, nothing intimidating.) You can do all sorts of easy stuff with a crock pot or in the oven/stovetop, too - pot roast and chicken cacciatore are pretty easy (basically, brown the meat, lower heat and let it cook a long time, add vegetables, let cook for a while.)
You can do a lot with a few basic ideas. My kids like beans and mexican food a lot, so we have something at least once a week: nacho bake, enchiladas, fajitas/soft tacos, beans and rice. If you have soy sauce, rice, vegetables, and some kind of protein (meat, tofu, eggs) you have the ingredients for stir fry or fried rice. I make all sorts of things with pasta - a family favorite is pasta cheesy bake (I throw a bag of frozen mixed vegetables in with the boiling pasta and include that in the bake.)
My kids also like lentils and chick peas, so I've been working my way through the recipes on vegweb.com, which can be hit or miss but tend to be easy and not have a lot of steps for weekday cooking.
It's great to start getting kids used to having healthy, homecooked foods! Even if you throw it together quickly, I think it's more tasty than any fast food meal.