Don't bring her a gift, its a first date, not a one year anniversary. Just make sure that it is a good date to give yourself the best chances of a second one.
If you really feel the need to give her something and the date does not require moving around much... which in itself may be a mistake if you have already known her for a while... you can get her a single red rose.
I really don't think you need to buy her anything. Firstly, it sets a precedence so she may expect something each date and secondly, to remember you by sounds like you don't hold much hope for another date. Just concentrate on being relaxed and enjoy the date. Have fun.
You don't want to come on too strong since it is a first date. Flowers if you must, but that is only if you feel you must. And, even with flowers, I would avoid doing an expensive bouquet of stuff. Something simple would be best and more sweet.
Think of it like this-- she is going on the date for you, not fancy expensive things. Buying fancy things will only detract attention away from you and even maybe turn her off.
Just bring a good attitude and feel great. :) Good luck!