Label and date. Put the baking dish into the freezer, when meal is frozen, remove frozen meal from baking dish and return package to freezer. Almost any plastic food container is safe for freezing food, in but don't use them in the microwave unless they say they are okay for that purpose. I know many an OAMCer who has lots of pyrex dishes they buy at yard sales or thrift shops and they use these, well wrapped, to store their meals in the freezer. It depends on how elaborate your meals and how much you cook from scratch.
Convenience foods are much more expensive than their home-made counterparts.
It might cost a bit more the first time, but because you'll be purchasing some items in bulk, the cost could actually be quite a bit less than you'd expect. Make extra counter space by turning off the gas stove and lighting burners as needed. Set up a card table in the living room. Use the kitchen or dining room table for food prep, too. If the washer and dryer are handy to the kitchen, you can use them as additional countertops.