How do I make her my FWB?

This chick and myself ended having sex on a camping trip and we are still talking. I know she is interested, but ive heard she is not one to get attached, which is perfect. We both have needs, and we both had a hell of a time that night.

I do not know how to approach her with I invite her to drinks and then head back to one of our places? A movie? Just something with the two of us?
How do I make it known im not looking for a serious relationship and just a sexual one?
And how often would be good to see her for sex?