Look at skateshops around your area. Check out all of their riders and see how to compare. If you feel that you are good enough to ride on their team, start dropping by the shop and getting to know everyone that works there.
Step2
If you have a friend with a camera, ask him to film you doing some of your tricks. Remember, style is everything. A nollie-flip back tail is a great trick, but if it looks forced or sloppy, it will be ruined. Try to flow as much as possible with your tricks.
Step3
Send your video to as many shops as you wish. If you are tech-savvy, convert your video to an mpeg or other format and send it to companies that way. If you have a good video, eventually companies will start noticing you. Just keep adding to your current video and making it better.