A few tutorials

Most CC tutorials on the internet cover the basics. A few good tutorials I found were the ones by BurgZerg on Youtube (Found here) and the tutorial done by Joshua Kinney on Digital Tutors. (Found here)

   
(Joshua Kinney: Customizable Characters in Unity)


(BurgZerg: Character Creation as part of his Hack and Slash tutorial serie)

The difference between the tutorials is that BurgZerg creates the CC as part of one his games in a series of Youtube video's, while Joshua's CC is created as a stand-alone implementation for Unity Based games.

Nonetheless both tutorials explain the process very clearly.