We used to keep lots of chickens in Phoenix. We would get the chicks along about the second or third week of September. They went straight into the tractor. At night, we would just herd them into a box in the back of it and close it up with a board and a brick. Then, first thing in the morning we would move the tractor to a fresh patch of grass and then remove the board and brick.
When they were about six weeks old, they went into a chicken yard.
You have to make sure they have a lot of shade and cool water in the summer. Turn on a lawn sprinker a couple of times a day in the summer.
Look out for house cats, dogs and hungry neigbors. Also, in the city limits you can have up to twenty hens, but the hen house has to be 25 feet from any inhabited structure.
Look out for nosey neighbors. I am not sure where you live in Phoenix. From my experience, the less White folks you have living around you, the better your poultry will be accepted.
Rufus