Most Helpful Girl
Oh there are lots of things. Favorites like restaurants, music, places she might like to visit one day, favorite movies and actors, her favorite shows on tv (if you don't know it ask what it's about). There are dislikes like foods, tv shows, games etc. I would stay away from politics and religious views as then it might turn into a debate. You can see if she likes things you have interest in, games, cars, sports, foods, places, etc.
Most Helpful Guy
In my opinion it's better not to think about it. If you're compatible you'll find stuff to talk about.