Our coop is 12x17x6 and our runner is 10x10x6. We was thinking around 10-15 hens and 1 rooster.... We are very new to raising chickens. We are getting barred Plymouth Rock chicks. We know we have enough room now just wondering if we will when they are grown? They will also have free range on a little over an acre during the mid afternoon after everyone gets home from school and work till bedtime.