Oh, you're over-thinking the whole thing. It's going to be great. The conversation will take on a life of it's own if you'll just let it. It doesn't even really matter what you talk about anyway. You're both going to be communicating far more than that.
The way you sit in relation to each other, eye contact, etc.- these are the REAL things being said. It basically comes down to one exchange:
Her: Are you interested?
Him: Yes. Are you?
Her: Yes. Really?
Him: Yes. Really?
Her: Yes. Really?
And that is a first date.