Understand and choose the tool
Sculpt and Paint workflow:
http://forum.unity3d.com/threads/25289-ZBrush-or-Mudbox-or-3D-Coat
http://www.polycount.com/forum/showthread.php?t=69404
3D coat retop:
http://www.youtube.com/watch?NR=1&feature=endscreen&v=Aizay09NMW8
Online Tool related
https://stephaneginier.com/sculptgl/