I agree with everyone's replies and suggestions on here. You're really young. Work on your basketball skills, and bodyweight exercises. All this, while your body is still growing and maturing, you will continue improving your vertical, and later on you can start doing the advanced stuff. It's not that I think you're not ready for the advanced stuff, but doing the advanced stuff right now won't benefit you much as it would later, and working on bodyweight stuff and bball skills will benefit you A LOT more right now.
Also practice a lot of max jumps. Practice jump form and technique whenever you play.
And yes, there is such a thing as correct form in squats. Go to a gym, 80% of the time, people are performing the squat exercise incorrectly, which at your age, can be pretty detrimental.