Australian Securities and Investments Commission (ASIC)
http://www.asic.gov.au/business-names
For business name registration, updates and renewal.
IP Australia
The Australian Government Agency that administers intellectual property (IP) rights and legislation relation to patents, trademarks and designs.
Consumer Affairs Victoria
Victoria’s consumer affairs regulator, helping create a fair market place for businesses and consumers. Through the website you can access information to help you run your business whilst complying with the law and protecting your business from scams.