Do you have a trader joe's near you? They have some raw nut butters for good prices, and low sugar jams that I love.
Breakfasts: Oatmeal would be easiest. Throw in any chopped dried fruit, and a few chopped walnuts. Vegan bagels (Alvarado Street makes great bagels) with nut butters would be a good way to go if time is more of an issue than money is. Pancakes, if you have the time. Ground flaxseeds (1 tbs ground flaxseeds + 3 tbs water) can substitute for eggs in many baked goods. Cold cereal would be easy, now that I'm seeing that you still plan on using milk. Lots of fruit.
Lunches: PBJs, hummus and tomato (and cheese) sandwiches, lentil soup, fake hot dogs (I like Smart Dogs - short ingredient list!), there are some good Mac & Cheese's out there, like Annie's, or Simply Organic. More fruit.
Dinners: Rice, sauteed/roasted/grilled veggies, can of beans. Can be great if you know your way around the spice cupboard! I do lots of crockpot soups (see other threads that have been posted recently). Lasagna occasionally. I tend to do one-pot meals, with a salad on the side. This all gets much trickier if your kids are picky! More fruit
One way to get started, if you want to wean yourself off of meats rather than doing it all at once, would be to make sure that you eat at least two of the three meals as vegetarian. (I do that with vegetarian vs vegan - two of the three meals are vegan, the other could be vegetarian. It helps make sure I don't end up relying on dairy too much.)
If you had more specific questions, we could be more helpful.