@Aristo: Elendra is quite right, it isn't possible to have experienced/elite/royal guard undead. A Zombie is a mindless shuffling beast, a Skeleton has barebones equipment (sword, shield, maybe a helmet) and some combat instincts, Wights have armour on top of that and a little better combat instincts, Revenants have high quality gear and retain almost all the intellect they had when living, but no sense of self.

I'll get to the other questions etc when I get back.