If you're nervous about making a good first impression and worried about whether the two of you will hit it off, then above all else, you need to relax. Remember, this is just one date, and it's just date one. Before going out, spend a few minutes (that's all it takes) breathing to help relieve any pre-date jitters. Breathe deeply and slowly, and concentrate only on your breath.
Your first few dates are all about getting to know another person. Sometimes there are sparks, sometimes there aren't, and often, you'll at least find yourself with a new friend from the experience. You can't force a long-term relationship -- it'll either happen or it won't -- so stay in the moment during your date, remember to breathe and have fun getting to know the other person.