Do AncestryDNA as currently they have the biggest DNA base worldwide over 7 million DNA tested people in it. The biggest DNA pond to fish in !
Look for information within any papers you have received from the adoption department that handle it, if you don’t have any apply for it, look in the resources section here on the website for your state in Australia for more details.
Call me ( 0263379903) and I will assist with how to begin with what your results are showing, you are not in the dark here we have a loving support an advice team here at the Hub, to help you understanding this new DNA sciences it nothing like we learn at school, but it all good and helpful with modern programs available to use with it, finding family members including your back ground roots. Remember you are not an Alien you do and will find cousins from both side of your parent’s tree.