Project NEMESIS

I built a GIS map off of Insect King's map.  It's still a rough draft.  I need to convert text over to annotation and place them better, and I need to place all of this into a geodatabase to set up topology so I can clean up the edges.  What I could use is some kind of distance reference so I can build a world file (create a spatial domain) that way I can flatten out regions and give them an accurate scale for measurement.  

Any recommendations on color schema or what-have-you.

Thanks,
Hobbie