It is quite easy to make your own baby food and freeze it. Most parents start their babies out on the cereals you get at the store, and then it's an easy progression to other foods.
Most parents like to start with fruits and vegetables first.
I recommend using a blender or food processor. They sell baby food grinders and some people love them, but I found it rather messy. You can also make larger batches in a blender or food processor. For vegetables, the process is very easy. When you make your dinner, allow some of the vegetables to cook longer so they become very soft, but not so long that they lose most of their vitamins.