First ever date tomorrow and I’m so nervous

HIII so i (18f) met this girl on instagram a few days ago and we have some mutual friends but we’ve never met irl. We’ve been talking back and forth and i went out on a whim and asked her out on a date and to my surprise she said yes!

Now here’s where I need advice…I’m so nervous. I’m picking her up and we’re going to the movies then out to eat. I’ve never been on a date before so please give me tips!! I’m so nervous and I really want this to go well! Is there any unsaid rules when it comes to dating I should know about? Please help a girl out