If you mean a new leveling minstrel on landscape, just trait red, use warspeech, and blow things up on the move.
If you are looking for a minstrel guide to healing group content, Dadi's guide is up to date and pretty good.
Dadi focuses on blue traited Resonance stance healing. The LOTRO forums have a lot of discussion currently of yellow traited Resonance and Melody builds. Healing in yellow includes more fellowship buffs and/or heals with zero or nearly zero induction times, but the heals are lower overall.
For group content, I would start with following Dadi's guide, and as you get more experience and knowledge of the various group/raid instances, you'll get a feel for which ones lend itself to using yellow instead of blue. For example, I always healed Draigoch in yellow because he interrupts inductions so much.