Skins: http://www.beamng.com/threads/introduction-to-skin-system.16931/ And tutorials+practice in your favourite image editor (except if it's Microsoft Paint). For modelling, there's many different tutorials, many people on this forum found this one very helpful: http://darkscarab.com/view/43 I learned the basics with this one: Here's a rather long, but very detailed one: This one is a tutorial mainly about shading: http://www.carbodydesign.com/article/59531-modeling-cars-in-polygons/ Aaaand another one: http://www.thomasbaron.net/modeling-a-car-a-high-end-detailed-tutorial/