If you want light effects, textures and so the best way is to use DirectX, but I know too little about DX to help you with this. Other guys here know more.

But if you want to do the hole thing buy youself, you must give an x,y, and z value to all points in the triangle/cube...
Then you simply use a couple of rotation algorithms to spin your object´s points in any way you like. I can post theese if u like, gotta look them up first
To make it look nice you must also use some kind of projection, check my post "Projection" in the Math forum, there´s some nice answers
API call "Polygon" or "PolyPolygon" might be useful for the drawing.