An easy way to get started is on the first level. There will be lots of people running around in the chaos and they count for kills, so just pick up something and try to kill them before the other enemies do. Later, try and kill the zombies, as they are quite weak. If you have a hard time finding them later in the game, just attack some of the demons around until they have that finish move above their head and then kill them. When you get it, throw on the “Ravager” Enhancement because it improves damage with environmental weapons.