There is no one right answer for the chicken coop and run questions. Each person has a unique situation, climate, available space and time, type of chickens, etc. Best to do your research, work on the chicken coop and run area during autumn and winter and be ready in the spring to bring your flock home - even if the flock is only 2 chickens.
Edited to add: You can also do a Google search for 'chicken tractor' if you want your coop/pen/run to be moving around.
