Guineas have to be trained to a coop for six weeks before they'll reliably come back. I locked my first bunch up in my new coop as I was building it. Then when I let them out they followed all the chickens right into the old coop and stayed in thereOnce I moved all the chickens to the new coop they moved back in there with them.
Then I lost all my originals except one, so I let my buff orp hatch some guinea eggs and since they were raised right in the coop by her, I didn't have to do any coop training.
As for free ranging, they mostly stick right with the chickens. They don't go far. They can fly though. Here's a shot of some of them up in a tree.
Thanks.