Each one has something unique to offer you in terms of skill development and personal satisfaction. Read on, get familiar with basic types, and try to decide which direction you want to go. They can be powered by rubber-band motors, CO2 motors, electric motors, internal combustion motors, or no motors at all. Once airborne, the Free Flight model takes its direction from subtle angles built into the airframe during its construction. Usually, these angles will cause the model to fly in a circular path to keep it from flying out of sight.
Smaller models are also more prone to windy day problems than their bigger brothers.
Both are guided by electronic equipment inside the aircraft that responds to signals the pilot sends from a hand-held device called a transmitter. You can feel sure there are few people in this sport who are self-taught. A qualified instructor can save you time, money and heartaches. An engine, or motor if it is electric powered, will probably be on the front of the airplane. A primary trainer will be much easier to deal with as you keep your trials and accomplishments on an even level.