My 8 chicks are 8 weeks old, when should I put in there nesting boxes. Also there Chicken Mansion in 8x8x7 it has 2 windows and a door on the front side and there door to the run is on the east side. How many roosting bars should I put in the coop and at what hieghts and should I put any roosting bars in there run. There run is 10 x 20.