Reply sent about dol guldur. My conclusion is that it should be a part of Mordor, but here is how I see the possible facions. (Killerrabbit has the long version)
Men:
-Gondor
-Rohan
-Harad
-Rhun
Elves:
-Mirkwood
-Lorien
-Rivendell (or rather: Imladris)
-Grey Havens (or rather: Mithlond)
Dwarves: (are there going to be dwarves, because it is debatable)
-Erebor
-Blue Mountains
-Iron Hills
Evil Races:
-Realm of Mordor (which includes Dol Guldur and Minas Morgul)
-Isengard
-Misty Mountains (Orcs of the -)
Ofcourse, I just joined this 'idea of a mod', but I thougth I'd just get this out right now