I didn't know how to deal with success. If there was a Rock Star 101, I would have liked to take it. It might have helped me.

This quote is referring to the difficulty the speaker experienced from becoming successful. They are saying that they did not know how to deal with being successful, and if there was a class (labelled “Rock Star 101”) that taught people how to deal with becoming successful, they would like to take it as they feel it would help them.