4) Oh dear and fluffy lord, does belle expect us to purchase booster packs? Does that involve real money???
Ignore that screen. You're not really supposed to interact with it until you get very deep into the game and start running out of new cards to pull from booster packs. When that happens, you start getting booster points that can be used to upgrade to packs where you might still be missing cards. There is absolutely no reason for you to engage with that screen until you've played for a good, long while, and it probably won't survive the transition to the eventual final game. I considered hiding the booster screen until you start getting points, but I haven't entirely settled on whether or not I should do so. It might be a good idea.
And no, there won't be any microtransactions in this game. Everything is earned with in-game currency ONLY. End of discussion.
Also: if you find the card game to be so daunting, may I suggest ticking the "Pure VN Mode" box in the preferences? That way you won't see the card game at all.