get instruction. You can find a list at usba.net. I believe there might be 1600 different systems in 3c, if not more. I once was told. There were five basic shots to work on.
1. The open break, learn to play it properly.
2. The short angle
3. the plus 2 system
4.Rail first
5. group 3 postion [ is when all 3balls are in the open, along the same long rail, within 1 diamond of the rail, and the cue ball is between the 2 object balls. As defined by Eddie Robin in his book.]
I'm only a Banger and No Math. or Engineer Degree!!! But a Studier of the Game!!