I've been in one for ~14 years. We have been in person except for a couple covid years when we met virtually. We have between 10-11 members always. 6ish have been around since the beginning. A few members have moved away, etc.

The way we run ours is that each member has an assigned month. You pick the book that will be discussed that month and we tell people 2 months in advance. If it is your month, you host at your house and serve dinner. (Although some host at other members houses if it is easier) Dinner can be super casual or themed or fancy.

We have a spreadsheet where we track books, each member's rating, etc. The way we pick books means we end up with very different types of books. This month we are reading a couple graphic novels, which is a first. Last month was a book on perimenopause. The books are quite varied.

The person whose month it is rates first and gives their review of the book and we go around the room and everyone rates 1-10.

Bringing notes to our book club would be totally normal and loved although there are many of us that don't do that either.

Hope that helps.