A lot of people just can't "become" quarterbacks. It's like having great speed, hands, or athletic ability, you just can't teach, practice and perfect every aspect of playing quarterback, some of it is naturally gifted. But if your dead set on playing quarterback, and if your sure you can throw a football at least decently, heres a few tips:
1. Learn to be a leader: that is one of the most important aspect of playing QB. your no longer the guy hearing the plays and being lead, your the leader of the team and offense. Always keep your team mates spirits high and never quit on your team.
2. Studying: Playing Quarterback is 90% mentally and 10% physically. You will not be asked to run or be as physically active as the rest of the guys or like when you were playing receiver, but that time will be spent watching film, learning the offensive scheme, learning to disect defenses etc.. Since you were a receiver you probably already have experience reading defenses and differentiating from man coverage, zone coverage etc.. which will benefit you greatly. Remember that your not trying outrun a CB or be as strong as a LB to take them head on, you job now is to learn everything you can about the opposing defense, and find ways for your offense to beat them.
3. Learn and perfect Quarterback mechanics: This is possibly the second most important aspect of a quarterback behind studying. People often say they have a strong arm, yet it never shows on the field or at the very least, makes it to the receiver accurately. Other times people have a strong, accurate arm, yet can't even drop back 5 steps to throw the ball.Proper mechanics gives you that ability to drop back effectively, read a defense quickly and gives you that velocity, accuracy, and ability to lead a receiver to a certain spot on the field for a completion. I won't go into every mechanic you need to perfect, but your coaching staff should be able to inform you and coach you on proper mechanics.
4. Utilizes your abilities: If you have a strong arm, amazing accuracy, mobility, or any other extra aspect that gives you an advantage, try to convince your coach to maximize the potential and skills you have so that you have more success playing Quarterback.
Practice and study as much as you can when playing quarterback. Don't be afraid to ask questions to your coach about anything whether it's the offense or defense, because if the quarterback doesn't know whats going on, everyone suffers.
High School Quarterback and Middle School QB's coach.