Locate a school that offers a photography degree. Most large universities have this option -- as do art colleges.
Check the types of photography classes offered at the school. Some photography schools only offer digital photography, for instance, while others have a wider selection of classes, including film processing and using film vs. digital.
Sign up at your local community college. If you don't have any experience with cameras but you want to learn, your community college is a good option -- as you typically don't need a portfolio and the school will to teach you the basics. In addition, attending a community college to hone your initial skills will be less expensive than a larger university.
Establish a portfolio of your work. Most colleges and universities require you to submit examples of your photography before allowing you to enroll. Take your 10 best prints and place them in a portfolio. You don't have to buy the most expensive portfolio, but it should look professional. Your potential school may also inform you of how to submit the information. Some schools require you to include 35mm slides of your work or one full-scale print. The exact specifications are going to vary depending on your potential school's enrollment policies.