I know that my first piece that I'm working on will be the first of a trilogy. I'm just not sure if I should plan the next two books before I publish it, or if I should just publish it when I'm done and then focus on the next book, publish that one, then start planning the last book; focus on each book one at a time. I know conceptually what is going to happen by the end of the third book, and I've pretty much planned out my first book (still in the process of writing). The second book, I figured, I could just brainstorm plot details after I publish my first work. Do you guys do that? Or do you scrupulously plan every detail (or maybe even a rough outline) of the wholes series first, and then start writing book #1. Because as of right now, I only know for sure about what will happen in my first book.