Theres just one spot you need to go to.. Its Sanur in Bali. June-August is their windy season, accommodation is available right next to the water, lessons are brilliant, my brother and daughter both learnt there ( fast learning curve with these guys ) and flights are the cheapest!! Just google bali_kitesurfing and speak to Jankie, he can organise the lot.
ps Im going for the whole of June.

Wherever you go, go carefully and enjoy.