I restarted with a 1400 sized one, so hopefully that's enough. I'm not quite sure how to do the scale, everyone's should be similar (I think?) but I can't grasp whether I'm putting a sprawling metropolis over a massive area, or just a city .
I got it from the tutorial, but I'm going to have a go and try to see if I can make it work by myself... Probably using what you just said though :X
Also, I was thinking that the North would be depopulated, but I might add a few abandoned or at least ruins, it is really near the plagueland center.