It's not just "what you know" it's "who you know". And in LA it means go to every party, every conference, every seminar. It means TALK (and listen) to every agent there, and don't be afraid to pitch them on the fly. YOU have to sell yourself, because nobody else will. I used to go to one friend's house (wonderful man named Lew Hunter), he was the Chair of the UCLA Film School and he had parties every other month for students, former students, and associates (I knew him from a writer's workshop at KNBC studios). And there were always agents there to meet "the bright new writers"... if you were good enough to sell yourself. I was never "quite" bright and new enough, but I sure had fun along the way. Go to the Edgar Awards dinners, the Beverly Hilton, Starbucks on Sunset across from the Comedy Store (Obviously, being in Boston puts you at a disadvantage, but you get the idea). I found and signed one agent (I nicknamed her "Psycho-bitch) at a lunch at the Grove Ballroom at the old Ambassador Hotel. You CLAIM that you're already a screenwriter, get your ass OUT THERE where the agents are and MEET them! If you can pitch a good story, it's almost scary how receptive they are when they're away from the office.