A great starting for any blog post is sharing a powerful passage or asking a great deep thinking question. The importance is to demonstrate that you are thinking more deeply about what you are reading. Another key point to all your blog entries is to get other people thinking as well. You will know you have succeeded when your blog post receives thoughtful responses from your peers in your book club group.
One last thing - edit before publishing. We want to show our best most professional thinking which means each post should have minimal to no mistakes.