How do I do things outside of school with friends I make in school?

[Mordecai]

A girl in one of my classes wants to be friends and I have had a crush on her for a while now but I don't know how we can become friends that aren't just "school friends". I want to ask her for her account so I can talk to her with social media but I don't know how to do it without creeping her out. I kind of want to wait for her to ask me so I can avoid that chance. I really suck at being social and haven't really done a lot with friends outside of school but I'm feeling more motivated since I like her
Also there's this club that she's in and I want to join next year. If I get in the club what should I do to talk to her more? I always see people in clubs have their own groups of friends and I want to do that with her since it'll probably help to do things outside of school