There are a number of drills you can do and there are plenty off books for that but something that most people over look is the mental aspects of the game. One you have to be a leader with out being a jerk. You have to understand the down and distance on every play. You have to know why some plays work on third and short and why they don't on third and long. You have to be able to adjust to the type of offense your team may run. Some may want you to drop back pass or sprint out pass with a run option. There is always the triple option. You should study the team you want to play for or have to play for and design your drills to simulate what they do. Example if they pass a lot from a drop back set then you better know how to move your feet to get back the necessary steps to set up in the pocket they set up. If they do a spread offense then you need to know how to work from a shot gun format. Depending on how old you are you may be asked to read defensives, if so watch football on TV and see what the best QB's do. If you have recording capabilities stop the play just before the snap and count the number of down linemen and linebackers close to the line of scrimmage. Then, if you can see the DB's see witch receiver is most likely to be open. In youth football the slot back is left open a lot of the time. He is covered by the safety who is back off the line about ten yards and in the middle of the field, if so the slot-back will be open on a side line pattern. If the Safety moves up on the slot-back then look for the wide receiver to be open on a post, if they are both not open run like heck. I hope this will help, remember the psychological aspects of the game are just as important as the physical so give them both a work out when you practice.

Dan Nappi
Youth Football Manual
amazon.com