Hello from italy , before the explanations, exist on program that can help me calculate distances point to point of my maps, and the scale of my map?

Mappa 1.jpg

This is my first testing maps, i am aspirant writer, writing my book i discovered that it is much easier to describe a journey if you have a good map.
So i started to draw and i found this site, it was really helpful.

Before to draw my definitive maps to my book i have choose to draw one exercise map, just to undstand the mechanics.
I started drawing the map on paper, than i transferred it on photoshop.
I have used one tutorial here on Cartographer's Guild to make the map, whit the help of some brushes i have found on deviantart and here on this site.

My goal is to make a map for myself only, not to be published, for the map to be published i will contact an expert, if i finish the book clearly (that is the hard part for me )