If you do not currently own your home, and are renting, be sure to check with your landlord before even bringing your pets home. If your landlord is fine with the idea, you’ll want to be sure that you do not build a permanent fixture, and that your coop can be easily relocated if need be. Next, consider how much space you can designate for your chickens, and be sure that the layout of the coop can accommodate however big your flock may be. Lastly, be sure your coop, even though it may not be as sturdy as a permanent fixture may be, is just as safe. Perhaps putting a temporary fence around your coop would also be ideal to provide a little bit of extra safety.
Chicken Houses Plus is a great online resource to help you pick the perfect coop.