I think you are going to be ok starting out. It is awesome your dad is helping you and you are raising birds at 13 years of age! You may lose a bird or two starting out. I have 14 birds in a 8x10 coop with a 10x10 run attached. I also let them free range when someone is around to help watch over them. I think you'll be fine as long as you don't add anymore birds. Especially if you consider meat and egg chickens are raised in a 18"x18" square cage. Then again I raise my chickens for eggs and meat not pets. I don't have anything against folks who raise them for pets with benefits. Personally I just won't get so attached to the bird that I could not eat it. JMHO