When playing games with my undead, here's what I take:
TYPE OF BATTLE, POINTS, LEADER, UNITS:
Mordheim -- n/a points, Baron Mogulus, two dire wolves, several skeletons and zombies.
Skirmish -- under 500 points, Baron Mogulus, dire wolves and skeletons.
Small Battle -- 500-1000 points, Baron Mogulus, small units of 5 dire wolves, regiments of skeletons and zombies.
Medium Battle -- 1000-1500 points, Baron Mogulus & Assistant or Vampire Count Garhamenga, same units as above but increase the size of the regiments and add in the Grave Guard and Spirit Host.
Large Battle -- 1500-2500 points, Baron Mogulus, Assistant & Vampire Count Garhamenga, same units as above but add Banshees, Wight Cavalry and Bat Swarms.
Monstrous Battle -- over 2500 points, Vampire Lord Garhamenga, Baron Mogulus & Assistant, same units as above but add something large like a Black Coach or a Zombie Dragon.
Here are 11 skull piles by Armorcast.