Tips on Where to Start?

So I'm 13 and chess has always been a hobby of mine. I've been in my school's chess club twice, dominated both times, and did a day camp over the summer, and did well in that. The only problem is, I want to start playing competitively (tournaments and stuff) but I don't know where to start. Could anyone give me advice on where to begin to improve competitively?

I would visit the uschess.org

and look for a club that meets in your area  

go into the members login section and click on clubs and tournaments

then click on your State

Yes visit uschess.org and join a club. Now to study on your own, I suggest you get chess books. In order for you to be competetive in tournaments, you need to improve your endgame,tactics and middlegame knowledge/skills.

Suggested Reading:

Chess Tactics for Champion(Endgame)

Winning Chess Strategy for Kids by Coackley(Strategy)

Pandolfini's Endgame Course(Endgame)