Does anyone have any tips for me for talking with potential employers?

As I stated in another question I asked today, I will be going to my school’s career fair tomorrow. I’m excited, but super nervous as my deadline to find an externship is approaching (April 18th), and this is the last career fair. I know who I want to speak to, and I have my all my documents printed out and ready to go. (Cover letters, resume, references.) This is a nerve wracking experience for me because I’ve never actually been interviewed. (I worked for my dad’s restaurant since I was really young) I know I should make eye contact, have a firm handshake- the basics, but does anyone have tips for me that would possibly impress the potential employer? I’m sure some of you are bosses or managers, what impresses you when you meet a potential employee, and what makes you say “Wow, I want them working for me.” Also, what are some good questions to ask them? (All the recruiters are representing restaurants/hotels/resorts/country clubs etc. I go to a culinary school, if that helps)