Check www.nswkba.com.au
NW can be gusty and crappy. N is good at heaps of spots. eg. Northern Beaches-Narrabeen/Collaroy South side- Brighton Le Sands, Dolls Pt.
Check website for others. Weekends can get really busy in Sydney. Be very careful of beach users. Make sure you go out with a buddy that can launch and land you safely.
Dont go out if no one else is out kiting. All the best