How to start talking to this girl outside of class?

I've been sitting next to this girl in lecture and we always talk before/during. I just got her number and want to start hanging/going out with her. When I got her number she said we should study together or something, which is what I was thinking of doing first...

What would be the best way to kind of move the bulk of the interacting from the classroom to outside of it? Should I kind of wait to start texting her until we've done something outside of class first, or doesn't it really matter?
How to start talking to this girl outside of class?
Post Opinion