I've raised broilers in a coop (converted storage shed) and large run and in the past. The coop was 8X8 and the yard was 30X50 feet. My system was to feed them twice a day. The first feeding was outside first thing in the morning. After they rushed out of the coop to eat, I would shut the door to the coop for the day. Right before bedtime, I would put their second meal inside the coop to draw them all back in for the night. I found it a good system, and had healthy, active broilers.
Some things to keep in mind.
--8x8 was just barely big enough for 25 broilers as they got to 8 weeks. It worked out OK for me as that's when I started removing the largest of them in a staged butchering that ended up with the last birds being butchered at 12 or 13 weeks. But, if you want to do or schedule a butchering for a single day, plan on that happening no later than 8 weeks.
--Starting at around 4 weeks of age, you will need to clean their coop every single day. I had put down a layer of wood pellets, topped by straw. Every morning, I would pitchfork off the dirty straw and lay down a fresh layer of straw. You will have a big pile of dirty straw at the end of process, so have a plan for that. I gradually worked mine into my compost piles.
--To get them moving, create some interest in your yard/run. I would put sprouted fodder and produce at the far reaches, under bushes, etc. to encourage them to move about and forage.