There is no guaranteed way how to obtain a Australian government grant, no matter how much you know about grants. However, AustraliaStartups.org may be able to help you with your research. You must first find one that you are going to apply for, by checking for programs that can be used for your purposes that you are eligible for. Then you will need to write a proposal to the programs you are applying for. The proposal should include what your long term plans are, what you will use the money for, how the grant would help you, and more about yourself or your small business. Then one or more proposal will be chosen and the writer of it will be awarded the grant funding.
You can also take advantage of the Small Business Startup Assessment Tool below and see the tools and resources you need to succeed at launching your business. It takes just a minute and will also tell you if there may be any funding programs available.