I have the 3d model (Audi TT 8N), but how to make the car that can drive and don't have orange "No Texture"?
That takes a long time. You basically need to learn 3D modeling, texturing & coding on an "acceptable" level
I am currently working on a Udemy course for Blender. It will be at least a month before I finish it, even when I finish it, I will still be half decent I suppose. --> There is a lot that goes into creating a decent mod for Beamng, especially vehicles.
Here's the link for it. (Save over 150$ by waiting for a periodic 90% sale. I paid $10 for it.) As of now, it is $19.99 https://www.udemy.com/blendertutorial/