At first round you have 5 ammo packs. You have to use it for armor first (or if you wanna save it search for an armor somewhere on the map) then go run and shoot method or just camp somewhere when things messed up. Now from all the kills you've got, you receive lots of ammo packs (depends on your kills or damage done to zms). Then go somewhere safe and make a laser mine base to make a stand or you could just go run and shoot and be a ZM SLAYER! Note: watch your ammo health . Very well then I hope these helps, that's all I can share. Share yours too! Hf and Gl with it. 
