I am a new poster but an old reader. I have read a lot preparing for my new chicks that will arrive in July. I had chickens about 10 years ago and used my father-in-law as my go to about anything chicken related. He has since passed so I thought I would try and find a new source and found Backyard Chickens along with some youtube videos and feel like I have learned a lot but always need more info. I have 21 pullets coming in July and never intended on have more than about 10-12 so some will find new homes once I know for sure that I have all hens. I did order a rooster but now I know I should've just waited to see what end up being a rooster. My order is made up of at least 2 but no more than 3 of Black Australorp, Barred Rock, Buff Orphington, Dominque, Speckled Sussex, Golden Laced Wyandotte, Rhode Island Red and Partridge Cochin. Not sure how this mix will get along or sure how well they will handle Alabama heat. My brooder is 3'x4', how long will I be able to keep 22 babies in there before I will need to move the to the coop 8x8. The chicken run is 18'x18' but figure I will want to keep them in the coop a while before they get to go in the yard. All advice is appreciated.