Seriously dude, it's simple:
1) Be respectful (without being a kissass).
2) Ask questions about her, and listen to the answers while looking her in the eye(pick one - nothing worse than switching back and forth from L to R when nervous).
3) Make sure you don't put more than three sentences together without lots of prompting from her. After three sentences, go back to rule #2.
You're a good dude, you'll do fine.