Have you looked at Adobe's site? Tons of great resources to get you going: https://substance3d.adobe.com/tutorials?software=Substance%203D%20Designer As just one example: https://substance3d.adobe.com/tutorials/courses/creating-a-tudor-house-wall
There was an example posted somewhere within that Twitter thread- I can't find it, though. They showed the version the generator recreated as something akin to a messed up VHS tape- huge blocks of random colors and structural corruption