Dark Horse Comics has created this nifty three-page PDF for those of you who want to try to write comic books. Sure, you can disregard it, but: a) most companies will not accept unsolicited submissions, and the ones that will, reject scripts with no discernible organization. Writers need to be able to communicate their ideas clearly to editors and artists, and b) while there are some exceptional books that build upon this topic, like Cooney's Writing and Illustrating the Graphic Novel and Denny O'Neil's book for writing comics "the DC way," this is a good and simple foundation... and is also free.

You can either access it HERE or find it the way I did by googling "Dark Horse Writing Guidelines."

Good luck.