i know that zmodeler is the first choice for modders to create vehicle mods for gta but i was wondering if google sketchup would work to create mod's?

You can create a model there, but then, for converting to GTA IV you'll need Zmodeler.

ok thank you, could i convert it to gta iv using blender or is zmodeler the only tool for converting it?

Zmodeler is the only modeling program that can export to IV afaik.

3DS Max, GIMS and OpenIV can export to IV but no vehicle compatibility yet unfortunately.

@OP: look for ways of exporting as .3ds or converting skethup files to .3ds, you will need to do some work though, skethup creates 3d meshes poorly as it is more of a CAD program really. It would probably be better to learn with a proper 3d program fist like Blender, GMAX, 3DS student edition, etc.

3DS Max, GIMS and OpenIV can export to IV but no vehicle compatibility yet unfortunately.

@OP: look for ways of exporting as .3ds or converting skethup files to .3ds, you will need to do some work though, skethup creates 3d meshes poorly as it is more of a CAD program really. It would probably be better to learn with a proper 3d program fist like Blender, GMAX, 3DS student edition, etc.

i just downloaded blender and i dont understand it, i cant find help online or anywhere on how to inport vehicle images to model or how to model anything.