Bed switch

So my older sister has moved back home and that means my son doesnt have a room. He has slept in bed with me since he was little. So that doesn't change but I had to put his crib in my room. BUT I had to take one side off of it to fit in my room. It is a crib/toddler bed so its meant for it to not have to have both sides. I want to train him to sleep in the bed by himself. It is at the foot of my bed. Maybe a foot off the ground if that. I am worried about him rolling off. It won't hurt him of course it isn't that high. But it still scares me. I have read all files on a fb page that helps with sleep training but I am looking for y'alls experience in having your littles in toddler beds and how they did. Any advice or just your stories will be amazing.