I would definitely try a black and white copy of one of the maps you're looking to print. Really the key when printing is to get that square to fit a token of whatever size you're using, most commonly a miniature (pewter, paper, or plastic). There are tutorials on using Post Razor for printing single images on multiple pages and they may have some additional instructions on getting things to work. In general, though, you can blow up any DPI image and get reasonable results... it all depends on your standards.