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I would definitely check out the Coops page, which Kelsie2290 gave you a link to.
As for foraging yard area, do you want an area for your birds to range in that stays green/grassy all year? Or do you mean a simple yard that your birds can go out in, get some fresh air, and scratch around in the dirt. The size of yard varies depending on your answer to those two questions.
In order for chickens to not destroy the grass in their run, they need to have a good deal of space. Unfortunately, I've never tried ranging chickens like that, so I can't tell you exactly how much space each bird would require. I would recommend posting the question in the Coops section of the forums:
Coop & Run - Design, Construction, & Maintenance Hopefully, members there can help.
If you just want an enclosed run, the general rule of thumb is about 10 square feet per bird. That gives them plenty of room to run around, stretch their wings, and dustbathe. If you can give them more space, that is even better, since more space usually means less fighting and happier hens.