Want to Play in College?

Do well in school.
Get in the sand and play as much as possible.
Join a club and learn proper technique and strategies.
Set Goals. Set Training schedule. Evaluate progress regularly.
Work on all the tools. Beach Volleyball is simpler then indoor volleyball, but not necessarily easier. In beach volleyball you need to be an attacker, defender, setter, server, blocker, etc. In addition, there are so many more tools in the tool box.
Play lots of tournaments.
Play in tournaments and events where college coaches are in attendance.
Get film that shows your versatility.