When I turned 18 I knew I wanted to get my officials license.  It is really easy to get your patch.  All you have to do is visit www.ihsa.org and start your application.  To become an official, you must first pick which sport interest you and apply.  Once you are approved, you must take an online test every year in that sport to retain your patch.  I am licensed in baseball, softball, and basketball.  There is a small fee to become an official, but compared to the money that you can make, it is just pennies.