Hi Laure,
Also check out NSWKBA KiteBuddies at:
http://www.nswkba.com.au/forum/kitebuddiesYou can also sign up on my mailing list for
www.kitesurfing.com.au by sending me an email to list@kitesurfing.com.au.
I send out wind updates, weather forecasts, suggestions on kiting locations and other info regarding Sydney kiting on an irregular basis, as the conditions dictate!
SeaBreeze has a great Buy/Sell section for 2nd hand gear and there are a number of really good kite shops around Sydney where the service is excellent.
Just be extra-careful kiting in winter -- the wind can be extremely volatile, unpredictable and can shift from completely quiet to gale force in a matter of a minute at times.
Make sure you're out with experienced kiters, and if there's a strong wind forecast be safe and don't go out.
Cheers,
Rob
webmaster
www.kitesurfing.com.au