The most obvious answer is to play! Pickup is a great place to obtain knowledge of the game, strategy, and throws. The environment is friendly, and the people are willing to teach.

Secondly, sign up for league! Summer League is a great place to gain skill. Since you play with the same team week after week, there is a certain amount of team bonding which always helps in learning the sport.

To make the answer short, if you are willing to put in the effort to play and learn, others are always willing to teach!