1. Thank you for all the kind words!
2. For now (version 0.1.x) you don't need to manage no fiefdom, only build a Shadow Institute, infiltrate Oryeonguk, and after you have more troops then them, invade Oryeonguk. That's it. The rest of the fiefdoms are not ready yet.
3. This walkthrough covers all the content in the game. I will keep it updated as more content is added to the game.