Depending on what your interest in theater is, I always recommend working on plays. It's a great way to be introduced to the field, and also a great way to be seen by agents and representation. I'm also a great advocate for studying acting at a drama school or a college.
“I've always felt that life is a novel, and part of it is written for you, and part of it is written by you. It's up to you to write the ending, ultimately.”
“If you don't accept failure as a possibility, you don't set high goals, you don't branch out, you don't try - you don't take the risk.”