2. There are research documents in the master's stage.
The second point is the most important. It is illogical to study for a doctor after finishing a master's degree. Doctor's research requirements are relatively high, and light research is useless.
To have research ability, send your research documents to professors at the University of Melbourne and the University of Sydney to see if they accept you. You can apply to the school after they accept you.
There are not many scholarships in public schools, but there are research grants, and you can apply for more projects after entering school. Doctors are more about helping professors do research work and continuing their own research under the guidance of professors.
Doctor usually lasts for three years, but whether you can graduate depends on your grades.
Tuition and living expenses are about 55,000 Australian dollars. The university of Melbourne is more expensive, and the cost of living in Sydney is more expensive, almost.