There is no bidding. You can make a "Request" but these are only considered for special circumstances and are not awarded often.
The roster is published monthly. Changes happen, but they don't seem excessive. it's common to have a lot of STBY days and you can expect to fly on those days.
The night stops include:
Melbourne
Narita
Taipei (Reduced Rest / Extended Duty Stop)
Osaka
Incheon (Occasional)
Expats will overnight regularly at all except Melbourne, which is typically crewed with locals. Also, expats will be rostered for overnight in Hanoi at least a few nights each month.
Other destinations (Turns) include: Hanoi and Da Nang
Occasionally when loads require, the A330 will also do turns to Hong Kong, Singapore, Bejing and Bangkok, but these are not frequent.