since I'm not so good at consistently planning a weekly menu, I always have a ready stock of little to no cook items, like:
-ham steaks from Costco
-potato buds or the like (flavored ones are yummy!)
-lipton rice or pasta mixes (don't know what their called)
-large bag of frozen buffalo wings or similar
-kielbasa
-costco sized bag of frozen veggies
-lots of ground beef frozen
-chili, taco, meatloaf mixes to go with ground beef
-canned spaghetti sauce and lots of different kinds of dried pasta
-lots of shredded cheese (can be frozen)
-easy to make corn bread (Sam's Club has one where you just add water)
My girlfriend browns her ground beef flavored with taco mix (but you could use whatever seasoning you like). Then when it's time to make anything with ground beef, you are two steps ahead.
A tip I have learned from having milk drinkers, I buy two gallons at a time. The second gallon is fresh until you open it. That way, I don't have to run to the store just for milk (which turns into a shopping fest).
Also, I buy two loaves of bread from Costco or Sam's. I pull one out to use immediately and freeze the other immediately. Mid-way through the week, we pull out the second loaf and it defrosts like it was fresh.
As for not eating out, just keep on driving past that Chili's restauraunt!
Good luck!