Novel writers write a draft before???!!!
I didn't knew that. Upon thought, it seems obvious. Why comic artists will be the only one who do that part of the process?
Anyway, yeah. We do that. We do it when we do the script, from a little phrase and let it grow until a full chapter, then we separate the chapter per pages, and then we decide in thumbnails how the action narrated on the script will go on, and finally, we sketch the pages, ink the pages, and color the pages.
In the best case scenario, we have all the serie in our heads, the big picture. Or at least how will it end. And in the best best scenario, we have writen a loose sumary of every chapter, from chapter 1 to last chapter, so we don't loose track of everything, as we keep doing chapter by chapter. Because things can change in the road, but at least the map to follow it must be clear.