Some weeks ago, I met a girl. We've been texting and talking on facebook meanwhile.
Next thursday Im gonna meet her, probably in the club. What should I do? What should I not do?

Some good points.
She's interested in me:
She's sending ME text messages when Im sending cheap remarks, or when Im just responding to her questions.
She initiates the chats on facebook.
On one of our chats, I started to talk about our "possible" grandchildren and what they would think of us, and she went totally into it. She then told me she liked massages, where I hooked in on, and said that I preferred what comes after massages. She said I had to deserve that, so I said "do I need to deserve a coffee by doing a massage?"

For some reason, my bad points were deleted, so I'll write them in a post reply

Bad points:
I met her when I was drunk. Really drunk. I smiled at her, she didnt smile back, I did some crazy faces, she laughed, I walked away. Just when I was walking out to go home, she started to talk to me, I almost instantly asked for her phone number, without using any Kino, DHV etc.. she gave it though.

Now how do I show her that I want to take it to the next level?

seems fine, you should do okay. She's definitely interested so just "game" her like you have been over text.

good luck