Furthermore, even though I waited a couple games to add expansion content, I would highly recommend adding "Homecoming" cards immediately. They are really easy to use and add a lot of fun unexpected bonuses and interaction, making it kinda fun to retrieve all your vassals. You have to be paying attention and remind people about them a couple times, but they are incredibly simple for what they add.
i forgot about the homecomming module. i had planned to add this straight in but forgot when i played my first game.... and second and third lol. will definitely add it in next game.