This is the standard minimum wording you and I are required to say (under the Marriage Act 1961) to make your marriage legal:

My name is Alexandra Conroy, and I am a celebrant duly authorised by law to solemnise marriages according to law.

Before you are joined in marriage in my presence and in the presence of these witnesses, I am to remind you of the solemn and binding nature of the relationship into which you are now about to enter.

Marriage, according to law in Australia, is the union of two people to the exclusion of all others, voluntarily entered into for life. 

From there, I need each of you to make legal vows to each other:

I call upon the people here present to witness that I, (full name), take you, C.D. (full name), to be my lawful wedded wife / husband / spouse / partner in marriage.

You’re married! You and your two witnesses over 18 years of age sign the paperwork and you’re all done!