If the kid was in high school, I think drills would be important. But since he's a bit younger, and new to the position as well, mechanics is what you should really be focusing on at this point. Once he's got that down and feels comfortable with the ball and at the position, maybe in a year or two you can move on to drills. Correct me if I'm wrong, but teams that young tend to run the ball on almost every play, right?
This is for a few years down the line, but if he's in high school and still sticking with QB, have him wear a dark visor on his facemask. For the life of me, I can't fiqure out why QB's in college and the pro's don't do this. I did it in high school and it was the best thing I could have done. Linebackers and safetys (who are taught to read the QB's eyes) couldn't see mine and had no idea where I was looking or where I would be throwing. Try being a single safety in high school with the WR on each end running a bomb and trying to figure out which one to cover when you can't see the QB's eyes! Made my job a lot easier.