Welcome to BYC! Great advice from Dobielover regarding ventilation and a larger run. A roof will help prolong the life of bedding in the run. I built ours with a decent sized overhang also helps keep the run dryer. Rain + bedding = nasty stench! Good luck with your flock!
Hiya, and welcome to BYC! We have lots of great forums and articles (see the tabs at the top) that can be very helpful. As always, if you have questions, just ask here or find the forum it fits in and post!