What If Jon Snow NEVER Joined The Night's Watch? | Game of Thrones

We go through how the events of Game of Thrones would change if Jon Snow NEVER joined the Night's Watch. What would Jon do or Robb's next move be with his "brother" by his side? How would this shape the War of the Five Kings and the actions of Theon Greyjoy? What does Catelyn Stark do while Jon Snow is still in her life? Does Bran Stark still go north to the Three Eyed Raven?