Do a chapter on downvoting, flags and the reputation system. There is definitely a lot confusion about that one.

As for channels, Smashwords is amazing, Goodreads isn't a publishing option though, just a place for listing reviewing and discussing books. You should probably add Play Books to the list as apart from Amazon, that is one of the major channels that Smashwords currently misses out on.

You might also want to consider making Steemit itself into a channel for your book in an online version. There is a bit of a logistics issue with linking that makes it essential to do everything in one week, what is kinda inconvenient. I did something like that using 'declined payout' reposts (of edited content) instead.
I won't link in this post as not to get flagged for spamming, but you can find the link on my profile if you are interested to see how it could be structured.