I only ask a couple things.
!) Use lj-cut if your post is quite lengthly. I'm going to assume that people are only reading the discussion if they have read the book, or if they aren't going to read it, but just want to read the discussion, so we don't need "spoiler" posts, but it would be helpful if you could give a quick synopsis if you have a long point to make, then delve deeper.
2) No name calling, or bashing of people. Don't take it personally.
If you aren't sure where to begin, think about the first "issue" that you had in the book, like, lets say for example, the issue of his sister being with an abusive boyfriend? Feel free to quote certain parts, and share your opinions on everything.
So, go ahead & start!