of your kites, the rebel is the best race kite.
Like Toby is saying try to get something going locally. It is super fun. We sometimes do casual races, but I would like it to become more solid.
Actually you do not need signals or buoys in the beginning. We have an island we go around. At some point someone will lose it behind the island as we are cutting it kind of close, but I guess it is just a risk we're taking.
In the beginning you don't need to worry too much about anything. The competitive genes will take over soon enough. Once you get something up and going, then discuss something more organized. It can be super social and so much fun.
Riding close to other, having your kites bump and riding really shoulder to shoulder to an extent where your boards are almost touching is a lot of fun, and very much adrenaline inducing.
If you have problems getting something going, try to set your vacation for Maui or Oahu this summer. Great gang of friendly competitors, that does not take things too seriously...but seriously enough to make it more fun. Three classes: raceboard, directional and TT. Crazy fun.
Also super fun to grab a few cold ones after the races...