Snowboard because you love it, not because you want to "be a pro".
Becoming pro usually involves winning contests, getting local sponsors first, and eventually getting the attention of the general community to the point where x company will want you to rep their brand.
If you are truly serious about getting a sponsorship, consider this: are you one of the best all around
snowboarders on your entire mountain? If your answer is yes, you should either make a video and show it to a local shop, or quit being such a dirty liar and get back to working on your riding.