What do I do after the perfect date?

I'm a senior in high school, and I just took a fantastic girl out on a date the other night. We really hit it off well and ended with the clic goodnight kiss on her doorstep. After such a romantic evening, I'm not sure what to do next. We've talked a bit since then but haven't really had the whole boyfriend/girlfriend talk yet. What's the next step for a dating beginner?