Hello and welcome to the sport. The absolute hands down best thing to do is take a roll class. By the looks of it you're not from the CO region, so google some paddling schools near you and take a class or three. Then, join American Whitewater and a local paddling club. They'll be great resources for finding paddling buddies, trips and instruction as well as supporting local kayaker interests. Then, as you accumulate your personal gear (PFD, Helmet, Paddle, Layers etc...) demo, demo, demo. Every boat has a personality all its own, as well as particular fit characteristics. Find something comfortable and fun, don't shy away from river running play boats at first, give em a try...the learning curve will be steeper but they cure alot of bad habits and are more fun to play in than big ol' banana boats. Then just keep running rivers and working on your skills. Good luck!
2510 47th St #A1, Boulder