Teach me how to SCH

[LazyMemories]

My WHM is almost fully myth so it's time for me so start working on another sub.
I know SCH is all about preventing damage.
But I don't really get how SCH work with there moves. Like for and Eye for an Eye should I cast that for only on bosses.
Succor I've seen a lot which is a barrier for everyone
Aqua is only a barrier for one person
But what are the other moves for a SCH and how should I use them? Any Cross Class skills I should have besides swiftcast? I already have that skill so I don't need to worry
But like the title says Teach me how to SCH.
Edit: Also if you guys could Teach me how to macro
When I go to the macro thing it says
Name... Which as what do I want to call the macro
But for the other part do I type
/macroicon Physick
/ac Phisick <t>
/pac Embrace <t>
Do I type all of that in one macro?
Also can you only use macro is dungeons, raids, ect?