The only reason I said 25 mph in first is that at lower speeds clutching up, it can come up way too fast for new people. At least at 25 you can just get the wheel a little off the ground and ride it out. Its all about the feel for getting the wheel up a little bit, not about hitting balance point in the first attempt. The lower the speed, the quicker the clutch up.
If he had a stunt bike with gear and a welded 12 bar, I would say do a 12k rev drop in first from a stop and learn the rear brake. On a stock street bike, practice riding out wheelies in first, and work comfort level up.