Yeah, uh...I have a date. Dating isn't really something I'm good at. I know how to behave and everything, but on a more abstract level...how do I conduct girlfriend things with her, assuming it goes well?
(I'm not ridiculously young, just ridiculously inexperienced.)
hum,... where are you meeting? Are you going to a movie? What's the plan?
Weirdly, it started as a business meeting and snowballed from there. Probably dinner.
Dinner is a good idea,... Just be curious about her, ask her questions, learn from her, while also providing info about you, so that it does not look one-sided.
Most notably, you should get to learn enough about her interests so as to give you an idea about your next date.
I definitely don't see this as a one-night stand; I think that any relationship with this girl, based upon what I know of her personality (we're already acquaintances, though not close friends or anything), would probably be medium-to-long-term and likely quite slow-paced.