alright bud, ive been kitesurfing for about 3 years. The advice so far to buy a foil and play around is great, this will give a you a good feeling of how the kite flies and where it works in relation to the wind window. Once you are happy then book a 2 or 3 day course with an IKO certified instructor.
Ive just seen that you are from galloway. Thats a bit of a trek to the coast.
mate check out the flexifoil forum, every conceivable question you could possibly have has been asked on there. also check out http://www.kiteboarder.co uk tho its not as busy as flexi.
oh and the effort is well and truly worth it. I had 3 hours out on the water at StAndrews today in 20 knot onshore winds. An absolute peach of a day.
Cracking sport.
Ref cost. the initial outlay can be a bit daunting.12m and 9m Bow kites plus board, harness and wetty can set u back about a grand if you are sensible and buy 2nd hand but your instructor should give u all the advice you should need.
My email is macmclaren4@hotmail.com if you have anything u want to ask drop me a line and ill send you my mob no.