you already started, your asking questions here on RCU.
after you research a club near you, check the top of the beginners page for the list of trainer planes, since you have some nitro stuff your already ahead of the game.
check some of the other threads there is a ton of info.
when joining a club ask if they have a training program ,you will most likely want to join the AMA Academy of Model Aeronautics , most RC clubs require membership, they offer insurance with membership, a major bonus. they also have a club locator to find one close to your area