Just something to keep in mind here. While the Stephen King book is indeed excellent for those who are wanting to be better writers, it is aimed at novelists, and that leads to a problem.
Comics are not novels.
Comics are not movies.
To my mind, a properly done comic is better than either. Comics allow an experience that novels and movies do not, and in order for a comic to work properly, the writer has to understand comics as a visual medium. This means understanding the visual language of comics (and what's worse, the dialects, as there are significant differences between the language of American comics and Manga, as an example), understanding how little things such as gutters work, how to affect time in a panel(s), and how to blend what you are writing with the artist's work.
The MOST common complaint I have heard about artists trying to do collabs is that the writers they have worked with don't know how to write a script that works as a comic. It is not easy. The books that I listed above (And I would like to add Brian Michael Bendis' Words For Pictures to that list) are written for the specific problems of comic book writing.
King's book, along with other genre specific books such as Ben Bova's The Craft of Writing Science Fiction That Sells or David Gerrold's Worlds of Wonder: How to Write Science Fiction & Fantasy are good resources, but the primary books for a comic book writer should be books about writing comics.
Something else to consider here. A story written for one medium does not convert automatically to another medium. This has been a truism since conversions started. A novel does not convert to a comic by the simple technique of transposing it to script format. Pacing is different, story telling requirements are different, even characters have to change. Dialogue is VERY different, and even reveals are different, since it's a visual medium.
Eagle
(Story is the goal)