Baldurs_Underdark
Hero
Thank you all for your comments, you've helped me a lot. I applied a scale of 50 miles per inch now and I think that is going to work. Now I'm trying to flesh out specific locations that will be the starting area of a campaign.
I find that it is easier to at least have a rough outline of the main plotline first, and then look at the map where this could take place. If you do it the other way around, you run the risk that you end up with a long list of events or locations that you want to write into the campaign, but no good story to do so. It will make for a messy campaign, or at least give you a headache in writing it.