How to start talking to this girl outside of class?

VaTechM6
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?
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