Printing a map to sell

Hello, I'm trying to create sellable A3 maps of walks in my area. I'm looking for ways to print a map legally to sell and was wondering if OSP can help. I will be modifying the map a bit (only the print version) by giving walkers a thick red line to follow and also barcodes to videos to explain historical points along the walk. Can I do this and how can I get a good enough copy to be able to print it. I hope someone can help. Thanks Carl