Northbridge is near where I work and I think it's a pretty nice area. Can't help with preschools unfortunately, but I do know it can be very hard to get kindy places.... as with many things in Sydney. I hope you enjoy your time here, it's hard to be away from family and friends, but try to remember you're here for a good time not a long time and you will be back with them soon. I'm sure some BB girls will meet up with you and make you feel welcome if you like!