If there is something in the court system in regards to you, you can find this out. You would need to call the courts though not legal aid. So probably the Federal Magistrates Court closet so you.
Not sure in regards to a location order if you are notified or not. In all our past court orders it is part of the order that we must notify the other party of a change in address or phone numbers within 7 days of the change. This seems to be pretty common to all orders I have read.
If there are safety issues you would need to go through the courts to get it down on paper so that he does not have to know your contact details.
You should talk to a lawyer specialising in Family Law as soon as you can. So many things that you can think is doing the right thing may in fact not be.
If you are in Brisbane I can give you a number of a great family law lawyer (although she is not cheap).