Last New York Comic Con me and my friends bought some original artwork, both Marvel and DC. I had already made a digital template of comicbook pages for me to use when drawing in Photoshop, but after seeing how the real professionals do it I made a few modifications and made mine look a lot more fancy-smancy. I finally uploaded it for all you to enjoy.
The active area is 10” x 15” on an 11” x 17” page, with a very small bleed about .125”. I added the title, issue # and all that info on the top and some markers on what each guide line means on the bottom.
Use it however you want, just don’t redistribute it as your own, cause that would be not very nice of you.