Not sure how you will go getting work experience at YSSY - post 9/11 it's pretty tough. I tried to get some work at YMML last September but found it was difficult with all the security and what not - I ended up working for the Royal Vic Aero club at Moorabbin, which was fantastic.
What kind of career are you aiming for? You could always try Bankstown.
Good luck with it and don't be afraid to msg me if you need more help.