Build the same number of workers as with Terran strategy and start a Spawning Pool. Build 6 Zerglings and start to attack with full force. Build a Hydralisk Den and keep attacking. If you have not won yet, upgrade to a Hive and get Mutalisks and a Spire. Build a Queensnest and upgrade to a Hive. Move in with Zerglings, Hydralisks, Ultralisks, and Guardians.