Your overlord will be in his base momentarily and tell you all you need to know. So, you are happly producing your drones and are reaching 9 or 10 supply, what do you do? Well, if you are playing on Zerg's home stadium of Scrap Station or on Desert Oasis, then you do nothing.
Here, I will teach you how to send those Zealots packing. I've decided to write a guide on beating the 4 gate push that is all the rage right now in the 1v1 leagues.