SCH 101 break down really quick

Selene - for farming/turns known
Eos- For learning or hardcore DPSing as a end game SCH's Eos can heal up to 1400-1800 with Fey and Rouse coming off a 30 sec GcD

Macros- You want to apply Fey illumination , Rouse and whispering dawn every min then 1 min later you tie Rouse X Whispering Dawn , its a great cycle buffing Eos and keeping party up pretty much all the time

Dont heal like a WHM , mages see damage and patch it , SCH anticipates damage

Sacred Soil should be used on raid wide high damage moves i.e Flare T9, Spit T6 , T8 , Tera Flare , Giga Flare etc I mean you could use it randomly on the tank but mitigating 130 for a 1300 hit isnt really worth the stack