There is a lot more to know about kiteboarding than how to fly a trainer or small traction kite. Just like flying an airplane, you can learn very rapidly but now deal with an emergency, different story.
Spend a lot of time reading through this site as instruction may not pick all this stuff up. Carefully consider and try to understand the basis of the ideas put forward in:
http://fksa.org/viewtopic.php?t=478
There were derived from the evaluation of many accidents.
Carefully evaluate instructors and pick a good one for your training. Some ideas along these lines appear in:
http://fksa.org/viewtopic.php?t=829
I learned how to kiteboard on my own almost 8 years ago at this point. The process came close to killing me, a few times. Today, there is no good excuse for most folks in Florida to risk going through that process again. Get good adequate lessons, you'll be glad you did for many reasons, even if it causes a delay in starting up.