For a detail oriented look at scripting for a monthly series there is the DC Guide to Writing Comics. It has a great method for tracking multiple sub plots.
For an example of a script and the final product all in one book try Arkham Asylum, 15th Anniversary edition. It starts with the full graphic novel and then ends with a copy of the actual script and notes from the writer about the process. Note, only the anniversary edition has the script at the back.