All that is necessary is that you be yourself. Come dressed clean and neat for the position you are applying for...NO flip flops!!!!
When going through the interview questions will require you relate job requirements to your personal experiences. For instance, everyone has had to deal with an un-cooperative or upset person...what did you you do in that instance? This type of questioning is used regardless of your work history, and can be fun as well as informative!
Good luck and best wishes in your search for employment with this company!