1) Bess. I don't love any of those options but I think Bess has the best chance to have the most targets from the available group and therefore has the most upside.
2) Avery. I normally like RBs for the flex as they're typically more involved than WR/TE but with Brown in a timeshare with Ballard and facing a surprisingly stout Dolphins run DEF, I like Avery to get a bunch of targets and pay off with either 60-70+ yds or a TD. Non-PPR, I'd probably go with Brown but with PPR I like Avery.
3) I'd actually roll with Green here. While he hasn't been lighting things up, he is still getting 15-20+ touches per game and therefore has a higher potential to put up points with a long run or TD. Blackmon had a decent game last week but I'd want to see that happen with a bit more consistency before starting him. I know Green doesn't have a great match-up vs Arizona, but I still think he has the highest upside out of the three options you have.
Best of luck. Here's mine: viewtopic.php?f=19&t=528444