It really is not very hard at all, and there are tons of websites to help or you can check out cookbooks for baby food at the local library. To make baby food you can microwave-steam or steam on the stove veggies or fruit until soft, and then mashed it up (in a food processor when baby first started eating solids). Put the food into ice cube trays. Once solid, pop out the food and put them into freezer bags. Simple.
Here is the best website ever! It has stages and types of foods for your baby.