When you first get them, you leave them closed up in the coop for 2 or three days and nights (if they're started meaning older pullets) so they learn that is where they are supposed to sleep. If mine get spooked the slightest bit while they're out of the pen, they run right back inside. At dusk, they get in the coop and on their roosts with no encouragement at all! If I wanted them in the pen in the middle of the day, I would just toss some Black Oil Sunflower Seeds into the pen/run and they hurry in because they are gluttons for BOSS!!! LOL! Even my best forager comes running for any kind of treat because she is so jealous of the other birds. Of course, if you start with day old chicks, you keep them in a brooder with a heat lamp until they are fully feathered or 8 wks. old. You can set up your brooder in the coop if you have electricity in your coop or a long enough extension cord. If not, once you move them outside to the coop at about 8 wks. of age, you do the 2 or 3 days and nights closed up in there so they learn it's their roosting place.