Father, please forgive me, I did not address you. . .
I have no clue on how to manage the conversation - but I am willing to learn. I'm willing to manage the conversation.
Here's what I would suggest you do:
1) Open a thread stating "We are going to begin a book discussion after Pascha to begin on ____x____ date (you pick it based on your availability since you are the facilitator). Ask for feedback as to what books people would like to discuss. If you have a book you would like to recommend for consideration, then please feel free to state that.
2) Wait one week for the nominations to come in. If there is a clear leading candidate, then go with that; if not, narrow it down to two candidates and open a poll.
3) After a book is decided, make a decision how to break it up. If chapters are long, perhaps one thread per chapter. If chapters are short, then perhaps by several chapters at a time. Announce the plan in the thread where the winning book is selected, but then open each individual thread as you reach the date (to forestall people jumping the gun).
4) For each section you will discuss, come up with 5-10 questions that you have while reading the text, and post them in the first post of the that thread. Others may wish to pose their own questions, but that will at least get the discussion started.
Does that sound like a plan you would be comfortable executing?