First of all head up on the Johnny Bravo avatar
Secondly, dude take it easy don't worry and become nervous thats the worst thing that can happen. Just be yourself.
Ok, now you are going to have to make some plans for tomorrow, when you approach her in the coffee shop, or she approaches you, do so with high energy to set the standard for yourself and tone of the next couple minutes to come. So for example, Walk in and say "Hello hello, how are you?" and give her a hug. And then right away go into conversation material like normal, e.g. "You know in France they kiss instead of hug, so when I met this French girl once I wanted to give her a hug, but instead are heads collided because she wanted to kiss my cheek, created quite a awkward situation
... blah blah" start with stories etc, create a easy going environment (the trick to doing that is creating some tension).And you are off on your own, if you think you could use the extra help, make a little cheat sheet with conversation topics, and add in a game like thumb wars, and I think you are well on your way