It sounds like you could do with a source of some basic information about Perspective, Model and World transformations. Or the OpenGL transformation pipeline. (try Google)
Some of the NeHe tutorials come in for a lot of flack for being out of date and a lot of them definitely NOT the best way of doing things. However, as a resource to learn from a lot of people find them very useful. The link to the lessons is on the right of the page.
http://nehe.gamedev.net/They're aimed at Windows originally, and texture mapping starts around lesson 6. I recommend just going through them one lesson at a time, implementing/porting them in Warp3D and asking on here for the equivalent Warp3D functions.
It's a little more involved but everything, certainly at this stage, is really simple and shouldn't require more than a few nudges and hints from people
Good luck.
