Job interview for being a waitress/ busboy at a bar. need answers? what about attire?

Look into the place you want to work and see what the employees there are wearing, and try to match the look/style. Don't wear shorts if they are all in long pants or skirts, for example. Don't wear flip flops if they are all in sneakers. You want to look the part already when they interview you. Typical questions might include your experience, your schedule - availability, how you deal with customers, your interests, etc.