The SYD-NAN trips will be the least popular trips and will be easy to pick up as long as rostering approves those trades, there is no bid system yet and not any time soon though trading is fairly easy to do.
Take home pay I would say you could look at roughly $1500 - $1900 for entry cabin crew, the pay has been shrinking with the layovers being reduced and the trips such as SYD-NAN with no allowances. The FAAA is involved with the crew now and this will most likely result in changes over the next year.
All in all I enjoy working there though as with any company there are some babies that should have their arses handed to them.
Good Luck..