Do not make them have to drag answers from you. Take over the interview if you can because they may not be very skilled at interviewing. It is okay to let them know you want to work at the company. Be neat, clean and organized. Shake hands firmly.
Physical appearance is important.
If they don't offer you a tour, ask for one. You don't know everything, so don't act like you do. Be confident and act motivated. You will be an asset to any company. Believe in yourself.