Hnk pages should be drawn on letter size paper. 8.5 x 11 inches with FULL BLEED (that means 1/8 of an inch will be taken off when it's put on the official page template)
Scanned in at 300 DPI or higher.
Transferred to a digital image of 5.5 x 7.75 inches (5 x 7.5 after trimming) with 300 DPI
Manga cover dimensions
Front flap: 2.5 x 7.75 inches
Front page: 5.5 x 7.75 inches
Back page: 5.5 x 7.75 inches
Back flap: 2.5 x 7.75 inches
Spine: 1.5 x 7.75 inches