When it gets to be close to sundown mine automatically are drawn to the coop area. Doesn't mean all of them go into the coop but they are usually within about 20feet of it. So I get my stick and hold it out like a long arm and hold my other arm out if needed to get them going in the right direction! I will occasionally have one chicken who resists this or changes directions but usually it's a pretty simple process. When you first move them into their coop, leave them there for 1week to get oriented with their "home" and then they know that is where they are safe and will want to return!!
Yes, lock them up every night or you could lose them to predators!!
Every morning I go out and open the coop door and leave it open, they then have access to the run/coop all day. In the evenings when I'm home I let them out to "free range".
They have been a GREAT addition to our family, we really have enjoyed having them, so I know you will as well!