I'm on my phone and I'm super lazy - so we should probably talk on the phone about this... Chickens are dumb and awesome. The eggs are fantastic. When you get them, lock them in the coop for 2 days straight. This seems to reboot their brains and they go in there on their own every night. I never once had to chase a chicken. The closer it gets to sundown, the closer they got to bed. Seriously. So dumb. And so awesome. While they can and may hop/fly over that fence... I doubt they will. And if they do, they'll come back. Honestly - I'd chuck a cheap/temp fence up from the side of your garage to the back fence and let them roam that whole area. You can build/buy a simple coupe to close them in at night. Keep it simple. Keep it easy to clean. All the stuff everyone else said. Let em roam.