Tiberian Sun Walkthrough: Nod 1
This is a typical beginning mission - small map, easy mission. You start in the lower left of the screen, in a mini-base. Build up your infantry units. There's tiberian to the north - build a refinery and begin harvesting it. You don't really need much, though. Get 15-20 guys, and when the bad guys appear in your base, destroy them. Then roam about a bit with maybe 10 guys and finish off any others you find. That's all there is to it!
Tiberian Sun Walkthough Index