1, AUTOCAD is the construction drawing. You must draw the stage size with AUTOCAD, and then model and render the lights, materials and so on with 3DSMAX. Finally, leave the shortcomings and later stages to PHOTOSHOP. It is very difficult to learn this thing if you want to watch a video, and it depends on your personal understanding of lighting color.

2.CAD is only an engineering drawing if it is flat, and it is not a flat software if it is three-dimensional.

If you have to use flat software, you can only use PS.

However, it is recommended to use 3DMAX.