Heh, thanks! I'm glad you enjoy my reffings!
To become one yourself, you first have to have taken part in at least two completed matches. The outcome means nothing as long it was not cancelled or ended in disqualification. With that under your belt, You can submit a referee "application" here. It will be in the form of a "mock" reffing showing an understanding of how things work. Make sure to read all the rules and guidelines on that page before anything else...
Afterwards, it takes patience for a League Official to have a look at it and review it. If they are pleased with your work, congratulations, you're a ref! You'll be able to ref matches for others, but only when you get permission from both trainers, until you get a grade that is. But even if you don't pass, try try again, making revisions along the way!
It is suggested to look at other matches and see how those people ref, for inspiration and a better understanding of things. Mind you, it doesn't need to be cookie cutter; be creative. Add your own style or flair that sets you apart from the rest!