[@Hawthorne]

I was just going to follow the simple fantasy setting of main currency being gold coins. Which are abundant and more rarer metals being things like pure steel, cold iron, orichalcum, mithril.

But the general currency just being set at gold coins. Using this you can leave prices up to your discretion. I will say in this world for perspective an night at a nice Inn/Tavern would cost roughly 50 gold for one person.