Each faction in Warhammer: the Old World has an army list. This gives profiles and rules for all of the models that make up that faction. An army list is broken down into six parts, though not all of these will be present in every army list. Some armies, for example, do not include any chariots, whilst others might shun the use of war machines:
Characters
Infantry
Cavalry
Chariots
Monsters
War Machines