The Stunt classes are pretty well spelled out in the AMA Competition Regulations. I don't know if the KOI uses straight AMA Rules or has some special variants.
To start in competition, forget about it being competition. ...for a while anyway... See it as an opportunity to show off your skills at the same figures as others are flying. And, most important, as an opportunity to get together with a bunch of other ukies.
The AMA CLPA Beginner Pattern is drawn in the Rulebook. You don't even need to be an AMA Member to look into the rulebook online (at www.modelaircraft.org
) Beginner Pattern is simpler than the full pattern, so it is worth a lookover... You'll probably need to be an AMA member to enter; membership apps are available from the contest officials, if necessary...
Another experience of competition is being ready to go on the circle when called, or as posted on a scoreboard flight order, crank it up, get it up, and fly. It feels good to have that confidence.
You'll learn more than you think possible by mixing with the other fliers. CL people are almost always wide open friendly and helpful. Don't be afraid to ask for help, within reason, of course... If you see a guy really trying to get his "thing" keyed real fine, an interruption might not be welcomed. A few take it more seriously. That's what they enjoy about it.
Enjoy! that's what it is all about!