BE HUMBLE, and don't walk into the interview like the hiring manager should be glad you chose to show up.
DON'T START DEMANDING A CERTAIN WORK SCHEDULE! It's the quickest way to turn off a hiring manager if you say "I only want to work Monday through Friday, no nights, no weekends, no holidays". (And yes, new grads have walked into interviews saying these things)
Thank the interviewer for seeing you, both personally and with a follow-up email or letter.
Think about why you want to work on this particular unit and tell the hiring manager your reasons
Think about what strengths or positive qualities you have that would make the hiring manager hire you over someone else, and mention them in your resume/interview
If you can, start gathering written recommendations from anyone you have worked with, even nursing instructors, and [b]bring them to the interview[/b]
Be flexible, and stress your willingness to learn, and try new things