First off, go here-

http://www.modelaircraft.org

That is the website for the Acedemy of Model Aeronautics. They provide our insurance to fly at special flying fields and also work to keep flying sites open and to encourage new people to enter this great hobby! You will want to join the AMA to fly at the local flying field. Well, you have to more than you will want to...

Find the local flying field by using that website. Call up the president or vice president of the local club (all found on that website) and tell them you've got an airplane and tell him you need some help and want to learn how to fly...That will solve ALL problems. Do things right to start off with and you will have a much more enjoyable experience with this hobby. If you don't want to call, just take a trip out to the field. Introduce yourself to the guys and tell them your story.

You will more than likely end up taking a trip out to the field only to find a really great group of people that are more than willing to help. You will soon learn that radio control fliers are the most generous people on the planet...