If you’re interested in pursuing legal medical cannabis, you would do that via your doctor.

General practitioners (GPs) who have any questions about prescribing medical cannabis through the Special Access Scheme or Authorised Prescriber Scheme can ring the special TGA hotline:

TGA Medicinal Cannabis Hotline for GPs
Phone: 1800 020 653
Monday – Friday (9-5pm)
Email: medicinal.cannabis@health.gov.au

TGA advice: https://www.tga.gov.au/access-medicinal-cannabis-products-using-access-schemes

Advice from other GPs:
https://medihuanna.com/
https://www.drteh.com/

Here is the federal government’s Office of Drug Control’s [ODC] website on medicinal cannabis which includes a listing of the licensed cultivators and manufacturers: https://www.odc.gov.au/medicinal-cannabis

The ODC used to have a listing of the actual legal cannabis products available, but that information had disappeared from their website by October 2017.

A number of Cannabis Clinics have appeared in Australia who help doctors and patients to access legal medical cannabis products. You might like to contact them for assistance, though be aware that they may charge for their service:

https://cannabisaccessclinics.com.au/
https://www.cdaclinics.com.au/
http://cannahealth.com.au/

Other advice on accessing legal medical cannabis:
https://sydney.edu.au/lambert/how-to-get-medicinal-cannabis.html