Hi
You can contact your states
http://www.dsr.wa.gov.au/ sporting body, or you can go through the MAIA (Martial Arts Industry Association)
http://www.maia.com.au/ who will charge you 4 times the cost. There are also other ways, such as the international college of kenshusei
http://www.kenshusei.com.au/ but this is like a uni degree for martial artists & will probably cost you a whole lot of money.
Hope that helps