I need a pep talk!

[lightningandsnow]

So, for the past week or so, I've been texting/emailing this girl I met through a craigslist personals ad. She seems really intelligent and really sweet, and I am fairly sure that she isn't a creeper. Anyways, I decided to give her a call today, but she couldn't pick up because she was driving. She sent me a text saying she'd call me later tonight.

I'm nervous! What do I say? How do I make a good impression?