A good way to get your network going within the entertainment industry is as a PA on a film shoot or TV show. And production listings are the way you find out the who, what, where and whens of how to get in on those opportunities.
This article is one of the most direct and clear cut I’ve found on the how. It hits the bulls eye. I’d of added for non-LA residents to get in touch with your local film offices, both city and state, in order to have your resume included in their files amongst other things.
I highly recommend the read. It’s short but insightful.
Remember, Eli Roth started as a PA on film sets where he’d write while he ran “guard duty” outside talent’s trailers.