We are going to get chickens this spring, and are trying to get prepared for it. I was thinking a medium size coop with a run for the winter time (when there is snow on the ground) with an additional chicken tractor to free range in the summer. But do I need the tractor for them to be free ranging or is the run enough? Will the tractor reduce the amount of cleaning I need to do? How big does it all need to be (like a certain square footage for each chicken?)? Thanks--I'm new to all this, obviously!