I put them right on the roost the first few nights. Some will stay put, others jump on and off a few times before they settle in, some will try to hunker down in a nest box though I discourage this since it really upsets the layers.
With a mixed age flock I can't lock them in, since it would...
They will sleep better without the light. They will not be afraid if they are not disturbed. No matter how well intentioned checking on them in the night is bound to alarm them especially if they are not up on the roost yet. So.... if you must do it, the wait until well after dark and be as...
I agree with "debid" and want to add that, if you keep food and water in the coop removing it at dusk will help them settle down quickly. Meanwhile just go in the house and ignore them.