In high school I'd use a shitty printer to make "home made" posters, they were terrible so I don't want to do that even if I had a decent printer these days.

One major thing I'm wondering is if you can have something done like this in a major store. If so can I copy image files from online and take it to someone, or would such a place need something physical to copy?

Any ideas would be appreciated! And I'm not sure if this is the best sub for this but I lurk here a lot and there seem to be a lot of knowledgeable folk.