Some people say popping them in after bed time works, but that isn't my experience. Supervised free ranging with several places with water and food works best for me. After a week or so of that where no one is too feared out then put them in the run together. Again, I can't stress too much that having more than one food and water is important. They become "Bully Opportunities". You want to make as few of these as possible. It's probably harder on us watching the process than it is for them. I practically cried when they all finally became a flock. (although Agatha still likes to play "grab the hat" at bed time)
