Where do you live? Most if not all states will have a state run film board . Find them and talk to them. If you are near a big city its even easier. Check craigslist and other classifieds. But if you dont know anything you are going to have to beg to get on set to work for FREE, and that will even take some luck. Dont expect to get paid for a few years. Also - read read read. Here are my suggestions. You could spend all summer inside reading these and it wouldnt be a bad idea (although youll learn a ton being on a set)
General/Techincal:
Digital Video by Pete Shaner and Gerald Jones
The five Cs of Cinematography by Joseph Macelli
Painting with light by john alton
Masters of Light by Denis Schaeft and Larrry Salvato
The visual Story by Bruce Block
Biographies of film makers:
Making Movies by Sidney Lumet
Rebel without a crew by Robert Rodriquez
Something like an autobiography by Akira Kurosawa
Script writing:
Screenplay by Syd Field
Writing Great Characters by Michael Halperin
Making a good script great by Linda Seger
Story by Robert McKes
Directing:
Directings Actors by Judith Weston
Film Directos Intuition by Judith Weston
also, sign up for net flix and watch at least 5 new movies a week, starting with the silient films of the early 1900s and work your way up through americna, european and asian cinema