Yeeeaaahhh!!! I love dates. I always get nervous before a date as well. :) My advice:
Make sure you have plenty of time to get dressed. I have a two and a five year old, so I try to start getting dressed 30 min- 1 hr before I need to. Just in case there's a tantrum or a fight I need to break apart.lol That way there's no added stress.
I make getting dressed an event in itself. I'm your typical soccer mom during the week. No make-up, sweats, cap, etc. So when I have a date I enjoy getting dolled up, sometimes more than the date itself!! So enjoy picking out your clothes, take your time putting on your make-up. While I do all this I have a glass of wine, and I listen to some music. I listen to dance music. It reminds me of my youth, when I didn't have a care in the world. :) So it helps me relax and enjoy the prep time before a date. If you can manage a bubble bath before all this, that would be awesome. Unfortunately, I haven't been able to pull that off so easily. :)
Last but not least, remember that this is just a date. If it works out then great, if not then you still had the experience of getting dolled up and getting out the house. So remember to smile, think positive thoughts, and have a good time.
Good luck on your date!!