Be dressed sharp. It doesn't mean to wear a suit if you're applying for a job at McDonalds, but you need to be dress well and to be well groomed.

Don't be dressed down and too relaxed. No jean or flip flops/sneakers.

You should be dressed sharp,just like the men. Your hair should be done and your make-up should be appropiate. Sunday best and fancier is what you should always wear.

No shorts or too short skirts. No visible bra straps or underwear. No cleave or belly showing.

Know what job you're applying for and the company. Know what criteria is required for the job. Practice interviewing. Get everything ready the night before. Practice good etiquette.
Follow up with a thank you note (after the interview).

In the interview:
-Ask about responsibilities
-Ask about relocation
-Ask if you can tell them about your qualifications
-Answer questions with confidence
-If you have a question, ASK!

Be prepared! Practice for the interview. Have good behavior and etiquette. Dress appropriately. Be calm and collected, and be confident!