I just had my first movie date with a girl. We interlocked arms and I held hands with her for the first time. We had so much fun but where do I go from there?
^Surely this should be a timeout offence ! Cant you ask your friends ? Asking complete strangers on an internet forum about something like this doesnt sound like the best thing Where do you go from the movie theatre ? Back home !
Ask her again, but go somewhere where you can interact with each other instead of a movie. Laser tag, rock climbing, hike, bowling, ice cream, carnival, etc, the idea is to have fun together. I'm guessing you're pretty young if this is your first date, so just take it slow, enjoy yourself and be yourself. It isn't a big deal and you'll go out with countless girls over your lifetime, they're people just like you so treat them with respect and you'll be fine.
But Hans... Seriously? Don't worry about it. Be yourself, see if she'd like to go do something you also find fun and see where things go. Hold her hand. Smile.
If you really want a girl to like you, take her somewhere exciting to get her heart racing. It's a well established fact that people in general (and particularly those of the female persuasion) will transfer feelings of excitement and arousal onto the person they're with. (alertness and the "rush", not the sexual kind of arousal) One of the most arousing things is a rickety bridge beside a waterfall, apparently. We don't have one of those nearby, but I've taken a few ladyfriends up to a waterfall to look down from dizzying heights and damn, it works. Rock climbing is a decent example, too. The only times I've gone on a movie-dinner date was when I was thirteen and with my girlfriend of 3+ years, because there's movies we want to see.