I get kind of giddy talking about this stuff — I’ve spent nights hunting down the perfect template before a print run — so here’s a practical starter pack. Most professional printers (PrintNinja, Ka-Blam, and IngramSpark are the big names I use as references) offer free downloadable templates in PSD, INDD, and PDF formats. Those templates already include trim, bleed, crop marks, and safe areas, which is huge because standard US single-issue comics usually trim to about 6.625" x 10.25"; with bleed you’ll often work at 6.875" x 10.5". Always check your chosen printer’s exact spec sheet first — they’ll tell you required bleed (commonly 0.125"), safe margins (often 0.25"), color profile (CMYK), and preferred DPI (300 is standard).
If you don’t want to start from scratch, marketplaces like Envato Elements and Creative Market sell InDesign and Photoshop comic book templates and page layouts. Clip Studio Paint and Procreate also have built-in comic page templates and export options that play nicely with printers. For lettering/fonts, sites like Blambot and Comicraft are lifesavers for print-ready lettering assets. I always keep a checklist: grab the printer’s template, set document to CMYK at 300 DPI, place art with bleed to the trim edges, keep important elements inside the safe area, outline fonts or embed them, then export a press-ready PDF/X if the printer asks.
One more pro tip: do a single test print or order a short run first — colors and cropping can surprise you. After a few runs I learned that a tiny margin tweak can save a lot of heartache. It’s a nerdy, satisfying process and I love the smell of fresh-printed pages when it all lines up right.