I wrote this series of blog posts back in 2011. It's a little dated now, what with references to older movies and younger versions of Yours Truly, but the information about writing remains valid (and, depending on your inclinations, valuable).
It wound up being pretty comics-intensive. I might do other series in the future that focus on writing games and novels.
Also, for various technical reasons, it's presented here as a downloadable PDF. I've observed that it looks a little better when viewed with Preview than with Acrobat.