Hey Celine,
there's quite a few great spots nearby.
Flat(ish) Water -
Moona Moona Creek in Huskisson
Lake Wollumboula at Culburra (gets crowded quickly)
Callala Beach
Waves
Shoalhaven Heads
7 mile beach (Berry turn off) for a great downwinder to Shoalhaven Heads
If you want to meet people, Huskisson is probably the best place as it has a large regular friendly crowd and a kite school.
The nswksa website has some locations on the map too
www.kiteboardingnsw.org.au/locations/