Whether you want mass Marines, or Battlecruisers as quick as you can, this will get you started.
             1. (Game starts) Make 1 SCV, send the 4 you have to seperate Mineral
             2. (SCV completes) Send him to yet another seperate Mineral pile. Make
             no more SCVs, use the 5 you have to mine.
             3. (150 Minerals are accumulated) Use one of your SCVs to go and create
             a Barracks. (Make sure to choose an SCV that just returned to the Com.
             Center, don't pull one off a Mineral pile)
             4. (50 Minerals are accumulated) Start up another SCV. When he's done,
             put him on a separate Mineral pile.
             5. (50 more Minerals are mined) Make another SCV, when he's done, move
             6. (Barracks finishes) Move that SCV back to a separate Mineral pile.
             This is where you decide what you want to do for the game. If you're
             going for a rush, or if it's a land map, queue up some Marines, if not,
             make a Refinery when you get 100 Minerals. Also, make Supply Depots
             I have discovered a strategy that works quite well for Ghosts. When nuking someone who has detectors[in other words, just about anybody], send three ghosts instead of one. When delivering the nuke, spread out the ghosts. I put two of the ghosts just inside or outside of the detector's range, spread out from each other, neither of which is actually dropping the bomb. I put the nuking ghost well into the range of safety. That way, when your opponent kills the first ghost, he thinks the bomb is aborted. Then he realizes there's another one, finds it [the second ghost], and kills it. But, by then, the third ghost has suceeded in getting the nuke there. Ta-Da! you may also get whatever units were hunting the distraction ghosts!
             P.S: You're Science Vessel can use "defenceve matrix" all the ghost which makes them harder to kill.
             Yes, upgrades are the most important thing in this game, especially against the AI. Those engineering bays and armories are not just stepping stones for more advanc...