I first keep the guinea chicks in the barn until they're at least half grown. I keep feed and water in the barn for them, and they return to the barn for a while, but they eventually do go wild and prefer to roost in the trees during the summer, but during the winter, when there are no bugs they go to the barn for feed and water and usually go back to their original roost.
They are hard to keep, but they lay eggs and hatch them out, but they're TERRIBLE mothers. A mother will have ten or even twenty chicks following her, and every day there are fewer chicks. Some do survive, but I occasionally get more chicks to increase their numbers. It's also tough to keep them out of the road, and some eventually get hit by cars. Chickens are much easier to keep. and they never go in the road. And chickens do eat a fair share of ticks, but nothing eats ticks like guinea fowl, so they're worth the effort.