David,
Welcome to TSCEC.
I would recommend you ride 50+ SC for your first season.
The rider numbers are based on your starting row and position and change at each event. There are 4 to 5 riders start every minute. If you were assigned 3A at an event then your row will start at exactly 8:03. The riders on your row will be assigned numbers 3A, 3B, 3C, 3D, and 3E.
Come by my office the next time you are at Red River Motorsports and I will fill you in.
Bill Pearson
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Trailgage
http://www.RedRiverMotorsports.comRed River Dirt Riders * TSCEC * TORO
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