There are numerous ways to find a General Practitioner (GP), starting with this site here:

https://www.healthdirect.gov.au/australian-health-services

Or you could look for GP’s by suburbs:

• Broadmeadows https://www.healthshare.com.au/directory/doctors-gp-in-broadmeadows-3047-vic/
• Campbellfield https://www.healthshare.com.au/directory/doctors-gp-in-campbellfield-3061-vic/
• Craigieburn https://www.healthshare.com.au/directory/doctors-gp-in-craigieburn-3064-vic/
• Epping https://www.healthshare.com.au/directory/doctors-gp-in-epping-3076-vic/
• Lalor https://www.healthshare.com.au/directory/doctors-gp-in-lalor-3075-vic/
• Whittlesea https://www.healthshare.com.au/directory/doctors-gp-in-whittlesea-3757-vic/
• Wollert https://www.healthshare.com.au/directory/doctors-gp-in-wollert-3750-vic/