Starcraft 2 - JULY 27TH
I play Protoss so I can't really help you play Terran, but a few things you should know.
If your playing a Zerg it's imperative you send out a probe-scout to see want he's doing. If he only has six or seven drones mining minerals and a spawning pool coming out - you can bet he's gonna six pool rush. If this is the case get a gateway up and chrono boost a zealot. Also consider putting a forge down and building a cannon. Cannon + 1 zealot = 6 pool owned. Position your zealot at the narrow entrance to the choke you made with your buildings and tell him to hold ground. And if the Zerg fails a six pool he's in a really bad position. Chrono boost some more zealots and rape his base.