Points are called vertices, as vertex, lines are called edges and "polygons" are called faces.
I searched Youtube for tutorials.
It seems everyone kinda resorted to ZModeler, because it can import/export GTA 4 .wft files, but everyone of them either learned only how to import a file and change it, or they were already proficient with 3D Max, Blender, Maya and some other powerful 3D packages.
It is quite a challenge to find a tutorial how to make a car from scratch in ZModeler 2.2.6.
My suggestions from now on are:
Try ZModeler 1.07 first and then go to 2.2.6, because then it will be more familiar.
(edit, crap, the images there are dead, searching for alternatives)
Or: you decide to try out other 3D packages, which have more tutorials like 3D Max and Blender and try to do basic stuff, just to figure out what's going on.
Learn some time-saving techniques. Some powerful features they offer.
And then, when you learned how to make a car:
You go back on ZModeler and then you have to learn only the interface, because you can, e.g. cut up a car in parts in Blender, export it in .OBJ file and import it in ZModeler to assign parts, adjust the textures and shaders(materials), rig the meshes (make movable parts moving, like door animations), adjust the axis to prevent the car go spastic in the game, export it in .WFT and its paintjob (textures) in WTD.