Baptism Certificates (for Catholics Only) from the Church where the baptism was celebrated.  The Tribunal Staff can help you with this.

Marriage certificates (can be obtained from Births, Deaths and Marriages - Adelaide) http://www.cbs.sa.gov.au/births-deaths-marriages/marriages/

Divorce Form (all divorce applications are filed in the Federal Magistrates Court web site https://eservices.comcourts.gov.au/epod_applications/new