I built mine a small roost when they were about a week, maybe a little less. Now they are in their coop, 4 weeks, and they love it when I go out and use ME as a jungle gym...I usually have 3-4 birds on me at any given time, while doing chores, or just socializing with them...one likes to sit on my shoulder while I do chores...soon their run will be done and they will have lots of tree branches and logs with lots of bugs to eat.
I also give them cut grass clippings and bugs. They will run for all they are worth, to keep the bug, and a great game of "keep away" will ensues...great fun to watch!!!