I think the contact/liason person is different depending on exactly what & where you are applying for. With us they put a contact name on all the paperwork right from the beginning - 'Contact this person if you have any queries' - have you had a look at your letters etc from them? I'm hesitant to pass on the address we have in case it is wrong to do so!
Or failing that I've got a whole load of details for family liason officers in different regions, and I'm fairly sure that none of those are 'secret' as they hand them out to everyone - I could check and see what there is for NSW, but even within NSW I think there are different people for different bases. Do you know which part of NSW you might get sent to?