1. This should be in the Map Development subforum.
2. The things you call units are generally called armies, I and others would prefer if you would call them armies too to avoid confusion.
3. Have you read the [wiki page on map-making](
http://wiki.warlight.net/index.php/Map_Making)? A lot of your questions can be answered there.
4. If not, you could better ask specifically what info you need, a lot of other map-builders like me would be happy to give you that information.
5. I think you mean [Issander](
http://warlight.net/Profile.aspx?p=936783702)'s [Real-life Europe](
http://warlight.net/Map.aspx?ID=3832) with "real europe".
6. Do I understand it correctly that you want to include America, Europe and Africa in your map, but not Asia, Antarctica or Oceania?
7. Good idea! But, since it's your first Inkscape and map-making experience, you should try something smaller first. I mean, look at my [first map](
http://warlight.net/SinglePlayer.aspx?PreviewMap=5812), it sucks!