Need advice. Never had a girlfriend

So there's this cute girl in my English class. We've been making eyes and catching each other along with the whole genuine smiles thing. I've never had a girlfriend before. I've never even held a girls hand before actually pathetic I know but whatever. A couple days ago I finally got the courage to ask for her number and she gave it to me. Now we talk fairly often and text every once and a while. I'm wondering what to do next as I have no idea I want to text her more but have no idea what to talk about. Any advice?