Bakery consulting

I currently own a very popular small bakery in WV, due to an unexpected move we are selling the buisness. A couple is interested but wants me to consult for there location.  This would include all pastries, bread, soup, kitchen design, SOP, and menu.  I and very capable of doing this task, but haven't a clue  what to charge.  Any suggestions?

thanks, 

Karen Guse

https://www.facebook.com/WildBakery