Welcome to the board juvenilejustice!
CPLZ is correct. There are some things, however, that you should consider if you'd like to be recruited by them. First, there is a lot of talent in Southern California, Northern California and Arizona...all closer than Texas (where you say you are from). USC, historically, recruits well from these areas in baseball. Unlike football, they are unlikely to recruit much outside of that area.
Someone from farther away will need to find ways to be seen and evaluated by the USC coaches and will need to make it clear to them that you want to travel outside of Texas for college baseball. It is somewhat likely that they will predict that a Texas HS player 'dreams' about playing for UT, A&M, TCU, Baylor or TTech.
I would begin by writing to them and tell them who you are as a baseball player and student and why you want to go to USC. If you're a junior in HS, I would send them a HS schedule (even though they aren't likely to make it to one of your games) and a summer schedule when you have that. Later in the Spring, maybe a phone call to reiterate your interest. If you can make a campus visit in the Spring, call and ask for tickets to the game and a chance to talk to the coaches. And I would look for their prospect camps and consider attending one of them.
Good luck...and let us know how it goes.