Sry, no new guides so far... so get yourself a spec, group your hots, heals, specials and ohshit-buttons in a way you feel comfortable with, find yourself a guild, look up some instance-guides (
http://www.wowwiki.com/Instances_by_continent#Northrend is a good place to start) and enjoy healing.
(Tbh playing in WotLK is easygoing as far as you wear adequate gear and are informed about the encounters...)
And if you like some anonymous practice or want to test any addons just join some battlegrounds. ;-)