Have you checked out some of the previous Beginner Book Club picks? There’s been this post recently about Zenitendo, The Mysterious Sweet Shop being an ideal first book. Since the book club has read it before, there’s a collection of weekly threads with grammar questions and answers already, and also a filled out vocab list to make looking up words easier.
There’s also a post by Radish8 that compares previous book club picks here:
Comparison of Book Club Picks. They also recommend starting with Zenitendo if you’re looking to tackle books.
It might be worth a shot!