If you need to have your documents certified, you will need to ensure you have made photocopies of the originals and bring both the copies and the originals with you when you are ready to have them certified. A list of people who can certify documents is given at the link below. Note: the link is for Victorian applicants.
Copies of original documents cannot be certified remotely.
For Victorian applicants, please go to this link for current information on having your documents certified: https://www.justice.vic.gov.au/certifiedcopies