Regardless of whether you're a die-hard sports fan or not, sports are more popular than ever in modern society. Shooting a sports event can be one of the most challenging types of photography you will encounter (even for the most experienced photographer). Learning sports photography takes preparation, skill, and the right equipment.
SOOOOOO.... get to know your subject matter.
Find the best vantage point in terms of good lighting and maximum activity.
Bring equipment that has the best chance capturing the images you want.
The key to capturing all fast action sports is to develop your ability to concentrate and anticipate. You will do much better if you know WHAT to concentrate on and WHAT to anticipate.
Once you gain the ability to concentrate, anticipate, and have developed the other photography skills needed to be a successful sports photographer, there are various routes to becoming a professional sports photographer. Some photographers work for local or big time newspapers on "work for hire" contracts where all the images belong to the company who hired the photographer. Other sports photographers work freelance, or sell the pictures off after they've gotten that perfect shot. The photos can be sold to various publishing outlets or to stock photography agencies. So, if you are interested in making a career out of photography, your best place to start is with an education and then start making some impressive photos that people will either buy from you or hire you to make more of them.