When I was kid my mom had a monthly menu, so that is not a foreign concept to me. We didn't stick to it, but it was there (typed, in a sheet protector) to give her ideas before she went to the store. She did it so we would not get in a rut and have the same food every single week and so she wouldn't forget to make various items that we all liked. Being the 70s, there were quite a few casseroles, many with condensed soup.
I once took the time (before parenthood) to write a menu plan. I tried to keep it balanced between beef/lamb, pork, chicken, seafood and minimize the starchy foods. M-F meals are quick and easy. Sundays can be more complicated. Try to have leftovers for lunch the next day (or next two days, then the next night can be no leftovers).
This week:
Mon - brats, baked apples, sauteed cabbage
Tue - flank steak, roasted broccoli and carrots
Wed - grilled chili lime chicken, refried beans, SW Caesar salad
Thu - crock pot tomato soup (skipped the salad and grilled cheese that were planned accompaniments)
Fri - cheeseburgers, salad w/ tomato & avocado, corn
Sat - probably eat out / order in / or breakfast for dinner
Sun - grilled fish, roasted veggies