@Sissyhen, where are you located? You climate will have a lot to do with what and how much you can grow.
What are you feeding them, now? Are there less expensive brands available where you are?
You will have a difficult time meeting all of their nutritional needs without using commercial feed. And, it could be (much) more expensive. Some of the amino acids, like methionine and lysine, are critical, especially when birds are very young and developing.
Do a search here on BYC. There are several threads about this very topic. You might find some information that will help.