I WAS VERY CONFUSED HOW TO ACCESS CO-OP WHEN I STARTED, BUT ITS ACTUALLY EASY LOL.

HERE'S WHAT TO DO:

-Complete/skip the tutorial
-Go to the menu
-Select CO-OP, either host a session or join your friends

Notes:
Players need to be in the same region
The host will carry over the progression of the saloon/world, but each player will be able to level up their characters respectively