Knowledge of classical Latin will also open up the world of Medieval and ecclesiastic Latin, which is another realm of study in its own right. The best way to learn Latin is with the aid of a teacher. Hopefully you had, or will have, the opportunity to study Latin while still in high school. If that is not possible, you can begin your study on the college level. If you are unable to attend actual Latin classes, consider taking a correspondence course.
Most public universities offer correspondence or extended study courses.
For example, the University of Iowa's Division of Continuing Education offers four courses in Latin for a total of 14 credits. If you live in an area that does not offer Latin courses or if you prefer to work on your own, Latin lends itself very well to self-study. Wheelock's Latin , by Frederic M. Wheelock and edited by R. A. LaFleur. This book was written especially for students of Latin who do not have any previous experience in the language. The text is easily understood and a wealth of practice and translation exercises are included, along with an answer key.