First time bank teller, advice?

So i just got called for My first interview in a super Long time for part time teller at Flag Star Bank. i have over 3+ years with money handling so am not too worried about that part but what else can i expect? What would the dress code be for an interview or even every day for women? What kind of questions will they ask at the interview? And also would starting at 25 as a teller lead to anywhere good career wise? like would I be able to move up or get better positions in other financial institutions because of this job? Anything you think is relevant I would love to hear.