Also it sounds like a threat meter like Omen or Skada would help you alot, and Tidy Plates:Threat Plates addon even moreso. They all give you much clearer visual representions of your threat level on the mobs you're tanking.
Group pull: start with the highest dmg AoE first - Avenger's Shield, Hammer of Righteous, Holy Wrath, Consecration, then Judgement. Then repeat HotR till you get 3 Holy Power, then Shield of the Righteous.
Single target: start with highest dmg single target abilities first - AS, Crusader Strike (or Judgement first if the boss isn't in CS range yet), Judgement, Holy Wrath, Consecration. Repeat CS till 3 Holy Power, then Shield of the Righteous.
Devotion Aura, Blessing of Kings.
One thing you can macro is abilities like Crusader Strike/Hammer of the Righteous, or Shield of the Righteous/Word of Glory. CS and HotR share a 3s cd, so you can only use one or the other, while SotR and WoG both require Holy Power so you can only use one or the other. Example:
/use [mod:ctrl z;[mod:alt] y;[mod:shift] Crusader Strike;Hammer of the Righteous
/use [mod:ctrl z;[mod:alt] y;[mod:shift] Word of Glory;Shield of the Righteous
You can pretty much start every pull with Avenger's Shield, be it group or single, as you're running up to the mob/s. Then use *all* your other abilities, preferably the hardest hitting ones first. The only choice you really have is whether to use Crusader Strike or Hammer of the Righteous, since you can't use both.