5 Top tips:
1) Forget trying to over impress
This only adds pressure for you, raises your own expectations of how you 'perform' and inhibits you from being natural.
2) Be Natural!
When you are natural, you are comfortable, when comfortable you are confident and self assured when you are like this you are naturally funny, naturally likeable.
3) Dont try to be someone you think she'll like
Its easy to act all confident & strong, you dont need to do this, besides it's really tiring. You also don't have to be a comedian and have a witty remark for everything. If she doesnt like you, no big deal, everyone has different taste.
4) Friendly, Flirty, Fun
Forget about anything else, forget about being anxious, just have a laugh.
5) Just have fun for the sake of having fun and see what happens.
And finally, dont think with your penis, just let things happen naturally.
James