You might want to visit the dedicated Master's Racing forum here also,
Masters Racing (All Disciplines) - Bike Forums Those are some really good people that will be happy to help you in getting started with racing. Calls that posted above with some good information is a regular there, I think you will get a lot of good information, and support if you decide to go for it.
Bill
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Semper Fi, USMC, 1975-1977
I Can Do All Things Through Him, Who Gives Me Strength. Philippians 4:13