Cabbage's reply is spot on, but I'll share our son's journey:
9th grade was pivotal for him. Son was playing JV basketball (after coming off a middle school championship) and already had 1 year of JV baseball under his belt since 8th graders can play JV HS ball in our county.
Some of the other baseball players were working out and he wanted to join in, but I wanted to make sure he was doing workouts right and not just hanging out at the gym trying to prove something. So we added sport specific workouts with a pro in our area during basketball season, and oh yeah, school work.
By the time baseball started in the spring, he was worn out timewise and by his sophomore year he decided to give up basketball to just do off season workouts. (By his senior year of HS, he was playing rec league basketball which was only twice a week and loving it.)
He was a late season call up to Varsity in 9th grade and their team made it as far as the state quarterfinals. The winter of his sophomore year, he did a February college two-day camp, the only college camp he attended. It was mostly to see how he compared to the other players and to get a feel for what it is all about. His sophomore HS season, things began to happen....invites to unofficial visits, etc. He played for a competitive travel team and he committed during the summer between sophomore and junior years of high school.
NOTE: He was a middle infielder (the recruiting IS different than a pitcher's!) and committed to a fantastic smaller academic D1, after being passed on by several top baseball programs in our state and out of state.
Postlogue to high school ball: he wound up starting as a freshman at his college, while his friends that got recruited at those top baseball programs had to wait their turn. He was drafted as a junior and is currently in AAA ball.
Summary: as a 9th grader, try to get bigger, better, faster. Play on the best competitive travel baseball team you can. Play two sports if that is your wish. Maybe go to a college camp or two, but it not necessary until you are on varsity. If college ball is in your future, go to a school where you can actually play, and "if you trip on the curb and break a foot, you will actually want to stay at the college with or without baseball".