I'm a photographer in Southern California, how much should I charge for media (newspapers, magazines, etc.) freelance work?

I’m 26, have about 13 years experience in photography, 3 years expierence in the newspaper business as the only staff photographer on the team, and have won multiple awards with my sports photos. I want to focus more on my freelance work now for magazines and newspapers, instead of being tied down to one newspaper, but I don’t know what to charge. Does anyone have any ideas? I’d appreciate any views.