Maybe this guide will help you http://forum.pokefind.co/index.php?threads/a-guide-to-pokéfind-skyblocks.4332/ ;D
Did you look in the comments to see if anyone had answers? This thread shouldn't be here, delete this post and post it again in general discussion or in the support help section.
Hello Yeti_Productions! I recently made a guide that is just about the sign shops! Hopefully this will help; http://forums.pokefind.co/index.php?threads/short-guide-how-to-make-signshops-in-skyblock.4755/