Q: How do I even play Four Souls?
A: Instructions for the game itself are at the side in a pdf. For a video format, check here. If you have any specific questions about mechanics, try #game-questions in the Four Souls discord[discord.gg]--- you'll get much better answers there than here!
Tabletop Sim default controls useful for this game:

• F while holding a card (LMB) to flip Treasure and monsters over smoothly.
  
• R while hovering dice to roll them; R while hovering a deck to shuffle it.
  
• Numline 1-9 over the loot deck to draw cards.
  
• After setting the rotation angle at the top to 90 degrees, hover a card and press Q or E to indicate it's tapped.
  
• Alt-Shift to peek at a card that's face-down without revealing it or putting it in your hand. Other players will be notified you're doing this!
  
• Tab to ping where your mouse is, and catch the other players' attention. If you're not using voicechat, this is how people typically announce attacks and item taps.

Q: Does this have all the expansions like Gold Box and Four Souls+, and Requiem?
A: Yes! All cards are the "v2" versions with the new backgrounds and clarified effect text, and should be identical to how the game itself ships.