The easiest way I've found is to fill the freezer with things you can throw together to create a meal. When you make one of these items, make enough for several more meals and put the remainder in the freezer -
broth, spaghetti sauce, chili, stew, enchilada sauce, rice or any grain, beans, stew meat, chicken meat, shredded pork, meatballs
Other items that freeze well - muffins, pancakes, waffles, french toast, pizza dough
Also when you have leftovers, freeze some in labeled containers. Use them for quick lunches or dinner if you don't feel like cooking. On thursday night if there are leftovers in the fridge from the past few days, it's Leftover Night. Then there's also Dad Makes Grilled Cheese Sandwiches Night, and I've gotten out of another night's cooking...