I'd model reasonable behaviour and expect them to follow suit. I wouldn't let them get away with being a shit from a young age, so hopefully they'd grow up to be a nice, polite person.
Wouldn't force them to study, but I'd ask them what they were aiming for, if they wanted help, and give them their space.
Wouldn't force them to get a job, but I wouldn't pay their phone bill or fund their social life so they might like to get one.
And I'd just ask them to be safe. My parents always said that they would come and pick me up, no matter when or where, or that they'd pay for a cab if I was stuck somewhere or if the only option was getting into a car with a drunk driver.
Very much like what my parents did. I feel like they did a good job.