One thing I can already metion, is that you can’t Sculpt on a Mesh with a Subdivision Surface Modifier. That is, you can, but then You’ll only be Sculpting on the unsubdivided (unaltered) Mesh. You need to either Delete or Apply the Modifier(s) and then Add a Multires Modifier.
You can also learn a lot from this ‘workshop’ (even though it was made with an older Blender Version): https://cgcookie.com/courses/modeling-realistic-characters-with-blender
But the Fundamentals is certainly a great place to start: https://cgcookie.com/courses/core-fundamentals-of-digital-sculpting-blender ,whether you’re new to Scvulpting, or just new to Blender.
