How do I do this????

Okay so moving on from my old crush, there’s this girl at my school. I used to have class with her and thought she was really pretty so I got her number. We haven’t spoken a lot because I’ve been scared to talk to her, but I see her around school all the time. Yesterday she held the door for me, so I decided to shoot her a text. We then talked about FNAF for an hour before going off and doing our own thing, and then she sent me a goodnight message randomly. She’s single and I KNOW for a fact she likes girls so this is a good sign for me

We both had common interests and she’s super sweet to me.

I wanna ask her out but I don’t wanna do it too soon, I also need to get to know her more. I also want to possibly ask her to prom or something.. (hopefully)