I want to make my models look better

[Goku1910]

I need a quick run down on how to use NL2MAT editor to take existing textures in the model and make them look better in which ever methods you use. Such as making metals shine a little bit or have reflections. Or like how wet cement reflects.

I'm also trying to replace a solid color in a sketchup model which doesn't export a .JPG image for solid colors but when I replace it with the metal material in the editor it's just a black color and can't find any way to make it match the solid color it's replacing.