Have supporting documents handy

During an interview you could be asked anything. If youre a designer, the interviewer could ask for examples of your previous work. If youre a writer, they could ask to see some of your published work. If you are a web developer, theyre probably going to want to see what youve developed. If you want to look professional, its best to at least have this material to hand or be able to refer them to an online portfolio of your work.