The short version
Medicinal cannabis is not a consumer product category in Australia. Patients generally need a clinician to assess suitability, consider alternatives and risks, and prescribe through a lawful access pathway when appropriate.
Recreational cannabis is separate. The ACT has limited personal-use reforms, but those reforms do not make cannabis legal across Australia. Driving law is also separate from prescription access and can be strict.
For current rules, start with the TGA medicinal cannabis hub, the Office of Drug Control, and the relevant state or territory government site.