If you have power and water I'd plan to build off where that is. Keeping it as close as possible will really help you in the long run. Trust me as someone who has to haul buckets it is way easier to have a spicket close by
Are there any sheds or buildings you can use as a coop and build a run?
Well a few questions. #1, where do you live? I think that is going to be really important for people making recommendations. Most of the 100% pre fabricated coops are really too small for chickens. I've seen some people convert sheds into an awesome coop and build a run.
You could always shop...