Unless you have a particularly famous parent in the business, the single most important thing for you to learn to do well is auditioning. While there is a great deal of overlap with performing, auditioning is very different and has its own set of skills to learn and pitfalls to avoid.
"Richard’s unique approach has changed me, changed the way I act. He’s been instrumental in the development of my film career, becoming a series-regular and booking frequent guest star roles. His audition approach is a sweet science that is actually fun to use." Amir Talai—Harold and Kumar: Escape from Guantanamo Bay, Modern Family