Immediately following your ceremony you will receive a Certificates of Marriage from me. It is a legal document and some may accept it as a proof of your marriage.
However, some organisations may not accept this certificate as proof of marriage, therefore you may also like/need to apply to get a certificate from Births, Deaths and Marriages NSW (if married in NSW).
If you require proof of marriage to change your name or apply for a visa I would suggest you apply for a certificate through BDM after your ceremony.
You can apply at anytime after your ceremony and can order any number of certificates.
To apply for a certificate from BDM is a simple process, however they will charge you a fee.
Here is a link to DBMs NSW site for more details and current pricing
If you decide you would like a certificate from BDM prior to your ceremony you can fill out an application and provide it to me prior to your ceremony. I will then send your application along with my paperwork to BDM NSW following your ceremony and they will then send your certificate, in the mail, directly to you.