Here is the Deltia healing guide for all classes there is a:
Text version: http://deltiasgaming.com/2014/09/23/role-guide-healing/
And a video version: https://youtu.be/uCUTJ8PVZ1s
Hopefully this helps people get into healing a little bit better!
Excellent generic guide for heal bars.
I would point out, though, that Ring of Protection has been seriously nerfed since the guide was published. It's only 10s now, and costs almost 7k Stamina to cast, so not as viable for most folks without very large Stamina pools.