When you arrive at the audition, greet the auditors and offer your headshot and resume. They may already have a copy, but always have one ready. Most likely they will ask you your name and what you will be performing. It seems obvious, but have the answer ready. All they need to know is the name of the play or film, and the character if it's not obvious who you would be playing. Don't give them a synopsis of the story, the scene or what your character is feeling. Simply do your piece.