This video tutorial goes through the process of creating setting up basic materials in V-Ray. In this video I use the PBR textures from the website:
https://www.textures.com/
I have included the timestamps below if you want to skip to specific points in the video:
1:20 - Acquiring free textures from https://www.textures.com/
2:55 - Creating a new material
4:00 - Diffuse/ Albedo/ Colour of the material
6:14 - Texture mapping and scaling textures to the correct size on objects
8:30 - Reflection setting on a material
12:59 - Bump and Normal mapping to add texture
15:30 - Displacement and height maps to change the surface geometry of the object