Listen to no_steeze it seems to me that he knows his shit. Get a lessons that is a MUST! Kiting can be very very dangerous if you have no idea what you are doing especially with launching. Go to your nearest kite instructor make sure they are IKO qualified and get multiple lessons other wise you are not only a hazard for you self but for other people.
The sport however has to be the best thing that ever happened to me, Skiing cant even compare when it comes to jumping and doing boosts. Buy gear, two kites, bar, board n harness and you will be sweet to go after you learn how to use it all.
You get different kites for different wind speeds, bigger for slower smaller for faster, just think of it as park n pow skis. Right kite you the right condition. If you d go out on the wrong kite you can get fucked over so badly. I have seen people being dragged for hundreds of meters because they choose the wrong kite.
You have any questions feel free to PM me im more than happy to help you out