grammar - If you are talking "on behalf of" you and someone else, what is the correct usage?

If you are talking on behalf of you and someone else what is the correct usage?

On behalf of my wife and me

On behalf of my wife and I

On behalf of me and my wife

On behalf of myself and my wife

On behalf of my wife and myself

...

My understanding is that after that phrase you would carry on talking in first person.