Ok, first of all hey! I'm new here and didn't have time to post in the introduction section lol.

Alright, now down to business. I'm in high school, and I met this girl on facebook. To me, she's an [HB10] (I think that's how you do it?). Like, you could call it love at first facebook sight. She's hella popular, one of those girls that gets 100+ likes on every status. So I started spitting my e-game, got the digits, and have been texting her on and off for about a month and a half. We have a lot in common. I've asked her to hang out, she's asked me once or twice, but it's never worked out. So then I asked her if she would wanna hang out today and she said yeah. I really don't know what to do from here...like what should I talk about? How should I act? Any help is appreciated and thanks in advance.

sooooo how'd it go?

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"To get what we've never had, we must do what we've never done."

Waiting for OP.

But for future generations an answer to the question.

You don't really have to act in any way except as corny and cliche as it may be - be your best self.

You probably showed some confidence in your message relays and asking her. Seems she's into you too if she tried meeting you too, but be sure she's not just doing the whole "OH WE SHOULD TOTALLY MEET SOME TIME!" but not follow through routine. I've met many 'popular' folks do this often. It's not because they're nasty, it's just because they 'bite off more than they can chew' for social interaction. The mean well, but have trouble making it work, unless they really do adore you.
Anyways, be confident, tell yourself you are confident. Tell yourself positive affirmations. Go meet her but have a plan. Plan places to eat, plan some back up conversational topics, plan out some casual good clothes. Just a few things to keep the day smooth, and to keep yourself prepared against any nerves you may have (hence the clothing, places to go to, and things to say if you're melting into your shoes).

Good luck future PUA-trainees!

Say, do, think, act entirely how you want with no apologies. I don't want to say be yourself because that expression has been run into the ground millions of times, but be yourself lol Look at her like any other human being and tell yourself that YOUR the man and SHE'S lucky to chill with you.