Is the aim to find others who would like to contribute reviews, or to garner readers? Or both?
. . .
I'm going to try to find material on how to write good reviews if I can. That will give us some guidelines.
We have readers. I want to impress that point on everyone. Tens of thousands of people, likely well more than that, will read the reviews we're writing. But we need more people to write them, or we'll never get anywhere, and I think a book club will draw them in - they're a staple at most writing sites for a reason.
If you're more comfortable finding tips on writing good reviews, that's fine, thanks for suggesting it. What book are you reading?