I can say I simply cleared whole cementery with stack of priests and inquisitors in my army. First round hit all of them with evil shoal, bless priests, then hit undead archers with priests and inq. Second round you can hit again undead archers with your "fighters of light"

or Holy Anger blessed priests and get rid of some annoying undead stack (this way I minimized losts to single units, like 2% per battle), remember you got Chest of Rage, Magic and two ranged units ideal against undeads. (you can also add stack of bowmen with they frozen arrow to slow some annoying stack of ghosts). Other slots fill with some cheap tanks (as swordsmen, bears/ancient bears) or try to get Royal Snakes as an ideal melee unit till latemid game