Wheelchair basketball, hand cycling, sled hockey, and swimming are the most developed adaptive sports that already have teams, clubs, and opportunities to start and learn in the USA. This is because the sports and their activities are built around a club system, and these activities are easy to integrate with "able-bodied" athletes. For example, ice rinks all over the U.S. have sled hockey teams, clubs, and tournaments. Check out the USA Hockey web site to learn more about their disabled division: deaf hockey, amputee Hockey (stand-up), and sled hockey (sitting) are all divisions of USA Hockey, and you can learn about the clubs and rinks in your area that have ice times or learn-to clinics in your area. There is even a huge disabled hockey festival where hundreds of individuals come together once a year to play, learn, work on drills, and even try out for the national team! Another great resource for activities and camps is DSUSA (Disabled Sports USA). Go to their site to find out about activities, camps, learn-to-ride or -play days, etc.