I'm with [@AndyC] on this one. I'm making this up as I go for the most part. I have in mind the story that I want to tell for this arc, which really is just universe building in establishing what the Green Lantern Corps is about, who the major players are, and what their connections are to one another. I have a couple of ideas of plot hooks that I'm debating that I could run once the story shifts to Earth, but I'm playing this one by the seat of my pants pretty much.