How to get certification of copies for Australia registration?

I physically live in the US and don't know if we have any entities here that can help me verify the authenticity of the copies of my license, passport, and so on. It's mentioned in the registration booklet of NSW that you can ask the Justices of the Peace, Legal Practitioners, Magistrates... to help you with this. So my question is should i go to the police station or should i just find a lawyer to sign it? Do all kinds of lawyers qualify to certify my documents? Anybody has any idea? I'm kind of stuck by this weird requirement of NSW...
Any advice would be greatly appreciated!