Definitely start freezing stuff -- whatever meals you like and enjoy now are the best things to freeze (rather than trying a bunch of new "freezer recipes" which you may not like). Casseroles (mac & cheese, tamale pie, shepherd's pie, tuna casserole, chicken enchiladas, etc.) all freeze well. So do soups and stews of all kinds (almost).
Don't forget that you can freeze just parts of meals, too -- make meatballs and freeze them, then later you can put them with sauce and pasta, or make stroganoff, or meatballs subs. Fry up big batches of ground beef and onion to use later in tacos, spaghetti sauce, goulash, chili, etc. Make some turkey breasts (or whole chickens) and freeze the meat for casseroles and sandwiches. Cook beans and freeze in 2-cup portions (or thereabouts). Then you can have a "fresh" home-cooked meal by taking out one or two packages of different frozen ingredients.
Chicken nuggets, too -- or fish sticks, homemade. "Flash freeze" them on a cookie sheet, then package, so you can take out as many or as few as you need. Make a couple of pizzas and freeze those in smaller portions. Burritos, fajitas, "hot pockets" or calzones, egg sandwiches, all freeze wonderfully and will be good for quick meals for one or two people, or postpartum snacks for you
or dinner for everyone on those nights when you'd otherwise resort to takeout or hot dogs.
You might also want to invest in a slow-cooker if oyu don't have one already. That way you can prep the meal whenever you get a minute (the evening before, during AM naps, whenever) and then just throw it in the crock and turn it on.
HTH! Good luck!