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Shield of Righteousness and Hammer of Righteous are a Protection Paladin's two bread and butter nukes, which are both on 6-second cooldowns. You will want to cast both abilities every time they are up, and if you space it out, you'll have enough room to insert other spells in between. In comes the 9-second cooldown spells like Holy Shield, Judgment and Consecration. For instance, Consecration has an 8-second cooldown, but that's about as imperfect as this rotation gets. You could throw up a Holy Shield once you've generated some aggro to start off things, but it's really up to you. Holy Shield is just a good first ability to put up because it's basic mitigation.
From there, it is Shield of Righteousness, Consecration, Hammer of the Righteous, Judgment, Shield of Righteousness and Holy Shield.
Note that this isn't a hard and fast rule. If you'll need to squeeze in ability such as Exorcism or Holy Wrath, don't hesitate to do so. It'll be easy enough to get back into the rotation once you're used to it. This rotation will help you establish optimal threat and should have you on top of the threat list by a considerable margin.
