I'm not a chicken whisperer, either, but
This is what I did from the beginning. After they graduated from the baby box I put them in a "dog crate" inside the coop. I let them out of the crate and they stayed inside the coop until I was able to get fencing up. As my avatar shows, I have a door in front, which is blocked at bottom with wood. The sides go up and down (up at night). Once the fencing was up I left the coop door wide open so they can go back in there anytime (if they're scared they all run back inside, or when it rains). Between 8-8:30 they all start working their way back inside and onto their roost. One time they were all outside because they were excited about something, so I did have to herd them inside.
They are able to see outside of the top half of the door. I thought that was important for them to at least be able to see a little bit. Maybe it's too dark for yours to see inside?