How to make beards?

As a good place to start from, you would want to clone an existing beard and go from there. An idea would be to eliminate the alpha from the beard (chin & jaw) itself, leaving only the sideburn parts that you would want. If the beard has a bump & specular map, you would need/want to edit those to match (especially the specular mask). Specular maps for CAS always match the image ratio of the diffuse texture, bumps are usually square, but generally obvious as to where everything is mapped.

I hope this helps you get started.