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There are several routes you can take:
1) Get a degree in theatre or film production or both. Work in the summer at summer theatres or on independent flims, college can give you access to a lot of contacts to help further your career as well as point you in which direction to go. It really is all about who you know.
2) Move to L.A. or New York and just start taking any odd jobs in the field, many people work their way up from the bottom, but this road is a little tougher. You need some experience in the field to get your foot in the door. SO before you pack your bags I would suggest getting involved in local theatre or looking around for independent film companies that need help. Do whatever they ask you to do so you can gain some experience and remember to network so you have some names for your resume as well as contacts to help you get jobs in the future.
As with most things, you begin by doing online research. Search for careers in motion pictures. Then think about which aspects interest you. There's pretty much two ways to go. Either you can attend film school, which is expensive and time-consuming but will enable you to hook up with people who can help you later, or you can intern and get experience, which will do the same thing. What's important is to know where you're going. If you're interested in producing, interning as a gaffer will not get you there. People get "typecast" easily so take care in what position you choose.