In addition to what the others have said, officiating is an essential part of the sport. Without officials, we don't have a contest. And, if we don't have competent and concerned officials, we put the sport in jeopardy. Part of why we do what we do is out of a sense of duty to the sport and to the kids. For most of us, we received so much from the sport and this is our way of contributing back.
Some coach, some volunteer to help with events, and some officiate. All are important. By even asking about how to become an official, I think you probably recognize that you have a role to play. Welcome aboard!