In standard CS, you buy a helmet. Here, you loot plates. Always keep your plate carrier full. A player with 3 plates will beat a player with an AWP body shot.
Forget the spawn buy zone. In Warzone, you usually have a "Mobile Buy Menu" bound to the key, but some servers restrict buying to specific blue circles on the map. Learn the "Safe Zone" locations on maps like de_warzone_urban . Counter Strike 1.6 Warzone Download