j.ka as a trainee the total annual salary is $32,490 and after that you're on level 1 pay which is $38,075 (this includes the grooming and uniform allowance and miscellaneous expense allowance). For overnights you also receive $108 allowance in addition to your salary.
VA has PBS which is preferential bidding system for rosters - so you put in what you'd like and then the system builds a roster based on your preferences etc. Hope that helps and good luck!