S.F.
I tried putting the toddler bed in my bedroom. I would lay down beside him until he fell asleep. I would rub his back or sing lullabyes to him. I put the bed against the wall and the bed rail on the opposite side so he couldn't roll out. I also put blankets and a sleeping bag on the floor around the bed in case he tried to get out or rolled out and fell.
I then moved the toddler or twin bed to another bedroom. Sometimes he needed me to sleep beside him until he fell asleep. Then I transitioned to sitting beside the bed until he fell asleep. Then I transitioned to putting him in bed and telling him I would be right down the hall if he needed me. I would wait outside the bedroom door. He would walk out and look for me quite a bit at the beginning, but eventually he would just stay put because he knew I wasn't gone.