As Desciple suggested, get your hands on the Flight School DVD - Practice the basics...then practice...and practice some more.
The Challenge is a very capable kite, but does need to be tended properly - It really punishes poor technique, meaning that tricks may take a bit longer to learn on it that other, more error-friendly kites (E2, New Jam, Gemini etc.)
As for buggying - No! The Challenge doesn't generate enough pull for buggying, and the temptation to take it out in winds over it's suggested wind-range will probably end up with you vapourising the kite
Check the specs on Level One Kites, I think the Challenge is still listed - you can get specs etc. there.