Can someone give me a very basic strategy to play terrain please? I have never played starcraft before and I just got the beta key.
tyvm
I think the best advice would be to not start with terran.
But if you have to, the "normal" build order is 10 supply, 12 barracks, 14 (one!) refinery, 15 orbital command. You wall in your ramp with the first supply and barracks and one more building (usually the next supply). Then you start producing troops. Marauders are a pretty solid way to go; you need another barracks or two, and the stimpack and concussive shell upgrades from tech lab. You want to be making SCVs and using your MULEs throughout. Also scout with an SCV. You especially need to see if opponent is expanding anywhere. (If he expands, attack as soon as you feel comfortable, but within two minutes or so at the latest.) If you can't get through to see what opponent is doing, comsat scan his base instead of deploying the next MULE.
When you think you have an army that can hurt the opponent (say, a handful of marauders and a handful of marines), march them out and hit the opponent's least defended spot. Keep pumping units and pummel the opponent. When the troops are in trouble, either make sure they kill more than they are worth, or retreat and save your troops for the next push.
The next tech you'll aim for is a starport with a reactor; your plan is to make medivacs but if opponent has air or colossi, the starport also enables you to make vikings.
Play off single base to begin with. Expanding is too much to manage for a beginner. Single base also means you have to be aggressive and in the face of the opponent, which is a good habit to develop.