<human>: Provide a brief overview of the text.

Hey, everybody! So I hit it off pretty well with this attractive girl (20) on OKCupid and I'm not sure how to approach seeing her in-person for the first time. 
Our initial messages were very flirty, and she played along the entire time. Now, we segued into texting and it has become more informative  & formal as we ask about each other to obtain a more solid idea of each other's personality. 
So my question is, how do I approach contacting her to hang out to keep it casual at first? I'm not looking for a LTR or formal relationship, at least initially. I know calling shows more confidence, and I don't have a problem doing so, but I don't really want to create that "first date" atmosphere. 

I'm a 22/m, btw. And thanks!
<bot>: Met 20-yr-old girl on OkC and want to set up first encounter without creating formal, 'first-date' atmosphere. Text or call?