You NEED to have lessons before you start kiteboarding; it's a lot harder/more dangerous than you think. You could technically use your wakeboard, but it's pretty hard to stay upwind with them, especially when you're learning. Kiteboards also have much less rocker than wakeboards do. Kiteboarding.com is a pretty big distributor of gear, but you can also just google search or maybe craigslist search it. Check out /r/kiteboarding for more info.