"How does it go?"
Well if the English is "How does it go?" then yours is the most logical. e.g. "Does it need a battery?" My Italian-English dictionary gives:"How are you?" for all three. "come sta" formal, "come stai" informal. I also learned it on: http://ocw.mit.edu/courses/experimental-study-group/es-s41-speak-italian-with-your-mouth-full-spring-2012/ Speak-italian-with- your- mouth-full which is an Italian language class with recipes taught by an MIT professor. It's great.