AmazingArt is pretty much correct about everything he said, except instead of thinking "let me go and see if this girl likes me," you should be thinking "Let me go and see if I like this girl."
I agree with him that when you think too much about these things it can clog your head and make you more nervous, but I also know that as a beginner, you need SOME kind of guideline to get you started on the right path.
One really good way eliminate that tension that you feel when going on a date with a girl you never met from the internet is to already have inside jokes or role plays going with her.
So, when I'm texting a girl I'm gonna go on a date with, I might say something like "Yeah, look for the guy in shining armor on a white horse. That'll be me. And I expect you to be wearing glass slippers and a ballgown, missy!"
Then, when you guys meet up, you can be like "Uhhhhh, where are your glass slippers?" And joke with her a little about that. Its nothing crazy, but it helps because now you guys already have your own inside jokes that you can go right into as soon as you actually meet her.
As far as staying out of the friend zone, thats REALLY easy. ALL YOU HAVE TO DO IS HIT ON HER. Simple as that. Tell her shes adorable, then tell her shes sexy, then tell her you're thinking of naughty things to do to her. Its just simple escalation. There's a lot more to escalation and getting sexual, but I want to keep it simple for you right now. Just those three things are enough to get you started.
And of course TOUCH HER! Touch her shoulder when you're talking, touch her knee, touch her thigh. (Yes, it might feel uncomfortable for you at first, but do it anyway and get used to it. Eventually you'll start to do it naturally.)
If you guys are over 21, take her to a few bars and get one drink at each bar.
If you are under 21, take her to get coffee, then to frozen yogurt, then to just chill in a park, whatever. It doesn't matter. Just go to a few different places to keep it interesting.
As far as what type of stuff to talk about, you really just want to get to know each other. Here's why. She needs to know who YOU are before she sleeps with you and she needs to know that you like her and WHY you liker her before she sleeps with you. So, you tell her things about yourself and your life and your family and friends (aka filling in the blank canvas of your life) and you find out about her life and family and friends and compliment her on the things you like that she does (i.e qualifying her). Keep it relatively light. You can get a little deep, but make sure you always balance it out.
Hopefully that helps