Have a look at this almost 5 hour long series of tutorials from the team at Allegorithmic for creating your first substance material in Substance Designer.
The course is divided into four chapters:
- Ch1: Discusses workflow, Substance Designer and node architecture
- Ch2: Creating the height data
- Ch3: Creating maps such as roughness, base color
- Ch4: Material layering, exporting textures and publishing sbsar files