Hey Eric,
The follow up course to the revolver, texturing-weapons-in-blender-and-substance-painter, will teach you the substance workflow.
If you don’t have substance, you can use free alternatives, such as InstaMat which is free to download.
To learn more of InstaMat workflow, see the bonus lessons in the Tread course.
I suggest you learn more about materials and textures in the two fundamentals courses..
Materials and Shading Fundamentals
Texturing Fundamentals
Be patient, try not to get ahead of yourself, it can be exciting to get to the next stage, many have fallen at the next hurdle, shader nodes for example, can be a very daunting prospect for a beginner.
Take your time and have fun.
