Hi!
I'm happy you found the game! I'm a small creator, so my games are not so famous - but still, I'm so glad when new players find my projects.
Here are your answers:
1. Not really - I'm planning to release an additional pamphlet, but I'm not sure when I will do it. I can provide specific information about the items if you need them.
2. It's up to the table. In my games, if an Apostle ascends, they become a god-like scale. Think about the Moon presence from Bloodborne (not the boss fight - the lore)
3. It's a real restful moment.
4. It depends if they will discover different stuff. I.e., if you and I are investigating an altar, maybe you will find ancient runes, and I will find a cursed ritual on a scroll. In this case, both of us will gain Insight. 9/10 Insight points per game are a good average.
5. If you have 0 stamina, you cannot resist - that's something I should explain better, I guess
6. Parry and Stun are both fictional and mechanical triggers simultaneously. You can use Stun talking with a strange character in the graveyard to keep them quiet. But also, you can parry and stun to react to (or avoid) actions from NPCs.
I.e., a beast is attacking you -> you can parry the attack.
7. I'm not a huge fan of Devil's Bargain without helping the GMs to use it (I'm a GM myself, and every time I struggle to find interesting Devil's Bargain). That's why I didn't put it in the game: I had no space to add the rule AND guidelines for the GMs. But it can work without issue!
I hope you will enjoy the game!