Start out with one barracks, and keep it that way for awhile. Only make enough marines to fill the bunkers. Your first bunker should be near your cc. The next 3 should be made at an entrance where you can choke the enemy. You should make a refinery while your barracks is being made. When your barracks is done, get a factory asap. If you can make a factory right when your barracks finishes, you will have an advantage over everyone as long as you arent rushed. In the late game, you will be powerfully defended. You should make the machine shop as soon as the factory is done. You will only need one factory. While your machine shop is building, make an engineering bay. When the bay is done, make a missle turret as close to your scvs ,which are mining, as possible. You could be rushed with Mutalisks or Dropship/Overlord/Shuttle dropped, which means they load up a dropper with attacking units and drop them onto your scvs. This will cause great chaos, so protect yourself by making that turret. You should have 3 to 5 turrets near your mineral patches to defend against aerial attacks. If you are paranoid of an attack by air, make a few turrets on your perimeter, so that they cant touch ya
Fill your 3 bunkers and make more if you *know* (comsat
) your getting a frontal assualt. When your machine shop finishes upgrade tanks to seige mode. This is probably the only upgrade you'll need from the machine shop, since vultures arent so great. Seige 5 to 10 tanks scattered about your bunkers. -This is a good defensive position, in my opinion.
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