The best way is to talk with people who know you and your family.  Contact managers of stores where you spend your money, especially stores which are locally owned.  Contact factories and other businesses where your friends work, especially ones which contribute money to community needs.

Start your quest, not by asking for money, but by spending months telling the store and business managers how great skating is, how it makes you healthy, helps you do well in school, and trains you to do well and help others in many ways.  Get articles, in community newspapers, telling of competitions in which you and your team were successful.

After business managers understand how skating is important to making you totally the kind of person they are proud to be part of their community, then ask them for a little support, perhaps for a new set of frames, or for the cost of travel to a specific meet.  Tell them you'd like them to be a partner in your growth.  After people see their money has been important to your growth, you can ask for more.

Ask these managers and your parents how you can help their businesses, so they gain something from helping you.  Your newspaper articles should say the  business is helping you; that's good publicity for the business.  Perhaps you can get friends and parents to buy from the business.  Perhaps you can hand out fliers or do other things to help businesses.  Perhaps you can help with cleaning or something else the business needs.

All these things are much better done  by teams, rather than by individuals. If you aren't a member of a team, start one.  Even if there are no other speed skaters near you, form an "Excel in Sports" club with people who do other sports and want sponsorship.

Skate manufacturers, such as Rollerblade, Bont, and Hyper, do sponsor skaters, but only a few of the best.  If you want such a sponsorship, you should often be winning your age group in large skate races, where skaters from around your country compete.  When you are at these races, talk with the people in the vendor booths (if the vendor doesn't have a booth, they probably don't think the race is significant for them), or at least other skaters whom the vendor sponsors.  Ask them how to become sponsored.

Manufacturers and other skate vendors sponsor skaters because the sponsorship helps sell skate equipment, not to reward fast skaters. So, if you want a vendor sponsorship, start by learning what's especially good about their products, then tell other skaters.  Learn how to help skaters buy these products, and how to let the vendor know that you have helped them.

Overall, if you want help from someone, first think about how their helping you will help themselves even more. Sometimes all this seems more work than it's worth; if so, just skate. But the whole process of earning a sponsorship will gain you great experience in earning other, even bigger, things, during your whole life.