This is a up-to-date Holy Paladin Rotation for patch 5.4. If you have any questions or suggestions on the rotation, please let me know.
Note: This is just your basic rotation. For more advanced
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Low damage to Target
Use Holy Light, as it has great mana efficiency. If they need topped off, use Word of Glory or Holy Shock.
Moderate Damage to Target
Stick with the above spells, but throw in some Divine Lighs when needed.
High Damage to Target
Stop casting Holy Light. Just use Divine Light with Word of Glory/Holy Shock. If your close enough to the target, cast Light of Dawn.
This is the only time you should ever use Flash of Light. If you don’t have time for a Divine Light, start casting Flash of Light.
Low damage to targets
Start spamming Holy Light on targets. Throw in Word of Glory and Holy Shock whenever you can. If your close enough Light of Dawn may keep them up instead.
High damage to targets
Use Holy Radiance and Light of Dawn. Remember 15% of both spells will transfer to your Beacon of Light, so you can keep your main target up. Also you can get a AOE Holy Shock from Holy Radiance procs.
If you’re still having trouble figuring out your Rotation, or need a more advanced one, then check out the addon I use called Edge. It will show you how to set-up your talents, what glyphs to use, and detailed rotations for leveling, pvp, and raiding.