RE: How do I get started?
Club 40 - local club sport class type racing (with groups all over!) - 80~95 mph.
AMA 424 - Sport Quickie class - 110~120 mph.
AMA 428 - Quickie 500 class - 150~170 mph.
AMA 422 - Quarter midget class - 170~190 mph.
424 is entry level for pylon racing classes in the USA, the club 40 is basically a sport plane that guys use to race with. A club 40 plane can be used as a sunday flier, where the Quickies are better left for racing.