Put alarms on his door and windows so you can track his movements at night. Don't expect him to have the natual boundaries that most people have for appropriate behavior. You could just have them handy if it seems too extreme to put them up at this time. Protect him from crude, vulgar, criminal and sexualized people, behavior, language and visuals. They do what they see and hear and usually at the worst possible time.
Peers are especially important.
Role play how to handle social situations. I would teach him adult standards of behavior because it will take a long time to learn and you won't have to keep reteaching. Don't relax supervision and structure just because he's reached a certain age. This is a personal experience of mine. When Rick began to be sexually attracted, he choose exaggerated females as objects of attraction.