This is a little closer to a traditional healbot build. Most people don't put points in lightwell.
http://www.wowhead.com/?talent=dxg0zhxzbZfxtccMqV0M
If you go shadow for leveling, start with spirit tap and put all your points in the shadow tree to start. There are plenty of shadow priests in the priest forums with shadow advice.
Edited, Nov 14th 2007 6:38am by dadanox