They need a safe place to spend the night. Chickens have terrible night vision. They are pretty helpless during the night time hours, and must be protected. That means a sturdy coop with lots of hardware cloth secured with screws and washers. An electric fence perimeter might be needed to keep...
Since your in Mexico, it might be wise to avoid the heavy, dual-purpose breeds and focus more the lighter built Mediterranean breeds like Leghorns and Andalusians. They can tolerate heat better and will have a better feed to production rate. If most people buying your birds will be keeping them...
If you haven't done so already, check out the Learning Center.
https://www.backyardchickens.com/atype/1/Learning_Center
I agree that you need some basic chicken keeping experience before you jump into a breeding program.