This is tough, because this sort of thing is a dying art. If you bring the wrong gift, you are just as likely to give off the wrong impression, and be worse off than getting nothing. I'm guessing you aren't too old and that you really like this girl your dating.
My honest thought here is that you should ask your girlfriend, say that you want to bring something, and let her pick it out. First off, she probably knows the right sort of gift for the occasion, and (bonus) if it goes horribly wrong, you are going to have one person (the most important one) in your corner.
If you don't want to do this, I wouldn't do anything too creative. Flowers are the best (go to the florist, tell them the occasion, and let them pick it out, or go the CAG way, go to Kroger during some off hours, and if they have a florist, they seem to love to help, and it'll be about half the price).
I think creativity has a place, but I'm not so sure the first meeting is the best time. Just show up, dress nice, be polite, and let your real personality show through in subsequent meeetings.