Visiting China to marry Chinese citizen

Hello,
I am an Australian citizen, intending to go to Changsha, China late September 2011 and stay for no longer than 12 days. I want to marry my Chinese fiancé while I am there and return to Australia with her to live permanently. Could you please advise what procedures I need to follow to make this happen, and what visa's will be required for both myself and my partner?
Thank you kindly for your help and advice.