Interface
A picture of my UI and just how it works for me, feel free to experiment with your own UI and find layouts that work best for you. Your UI is a personal preference and you need to find what works.
Macros
Combustion Macro
This Combustion macro uses your troll (or Orc racial), your on-use trinket on slot 14 and Combustion at the same time.
#showtooltip Combustion
/cast Berserking (or Blood Fury)
/use 14
/cast Combustion
Remove Curse Macro
Uses Remove Curse at your cursor location.
#showtooltip Remove Curse
/cast [@cursor] Remove Curse
Alter Time Macro
Removes the Alter Time buff in case you regret using it.
#showtooltip Alter Time
/cancelaura Alter Time
Scorch Focus Macro
Casts scorch at your current focus target and if you do not have one, casts at your target instead. This is useful to snipe low health mobs with scorch while maintaining your dps on your main target.
#showtooltip Scorch
/cast [target=focus,exists,harm,nodead][target=target,exists,harm,nodead] Scorch; Scorch
Flamestrike Cursor Macro
This casts flamestrike at your cursor position rather than first giving you a targeting circle that you have to click to cast
#showtooltip Flamestrike
/cast [@cursor] Flamestrike
Interrupt Mouseover Macro
This allows your interrupt to be cast on a mouseover target and defaults to your target if you do not have a mouseover at the time
#showtooltip Counterspell
/cast [target=mouseover,exists][target=target,exists] Counterspell; Counterspell
Spellsteal Mouseover or Focus Macro
This allows spellsteal to be cast on mouseover target same as interrupt with the additional step of defaulting to a focus target if a mouseover is not present. Useful for stealing buffs in M+
#showtooltip
/cast [target=mouseover,exists][target=focus,exists][target=target,exists] Spellsteal; Spellsteal