First of all: it's important to have no pretentions. Don't go on the date just because you want to be in a relationship with her. For now, focus on the moment itself; having fun with her and getting to know her should be your main objectives for now. Just relax, chill out before the date, make you look decent and clean. Personal hygiene is so important, use deodorant before the date in case you get angsty, simple things like that.
Anyway, on the date itself, what may help is to be charming, be a gentlemen and be interested in her: listen to her, don't talk too much yourself. It all speaks for itself really. But what sounds so obvious and easy in theory, is often sooo hard to apply in real life. It's good that you can practice though. I couldn't, and that brings me to the next part of this post:
Disclaimer: this advice has (sadly) not fully been tested in practice. Some parts were, like the gentlemen part, girls always like it if you are a gentlemen. Show the gals that chivalry is not dead! Ofcourse personal hygiene is obvious as well, heck people in general apperciate that, not just girls.