Prepare him from now for his high school prom party. Teach your son at this stage the important qualities that gentlemen have. This will strengthen the father-son relationship as well. Teach the the basic qualities such as respecting a woman, a strong hand shake, table manners and politeness.
Teach him to help others by small examples such as offering his seat to a senior citizen or a pregnant lady. Make them understand the value of saying sorry and thank you.