There is a condition on student visas for parental consent and ongoing support, but this only applies to students under the age of 18. In order for you to apply for a student visa in Australia, you will need a letter of offer (LOO) and electronic Confirmation of Enrolment (eCoE) from your education provider.
The Australian immigration department requires some international students to file for their student visas at the Australian Embassy or Consular in their home country.
Immigration rules change regularly, so it's best to check the latest updates with your education provider and the Australian Department of Immigration and Citizenship.