basically you just ask if you should do one thing or another the next post answers and asks a question of their own/
you can take it seriously and actually ask about things you are considering doing or just have fun with it.
ex.
person 1: "Should I stay home or go see a movie?"
person 2: "stay home
Should I....?"
I'll start with a serious one which is the main reason I made this topic:
Should I watch Hot Tub Time Machine or Big Lebowski?