The very first stat that we will take a look at is going to be intellect. Yes, I do realize that this is pretty much a given considering it is the basis for all casters, including the holy Paladin. The more intellect you have the better off you are. At the lowest levels you will find plenty of mail/plate that has intellect. The trick is going to be at the higher levels where there are multiple stats on items. It will be imperative that you find the best plate gear with intellect that does not have pointless stats on it. (Do not worry, we will discuss the stats which are useless to holy Paladins.) As you hit the Wrath expansion, plate gear with true holy Paladin stats seems to be scarce. I would suggest looking at mail and even some leather gear that may drop random or that can be obtained from quests. The meat of the gear will be found in the instances or from crafters. As we progress farther into reviewing stats this will make more sense.
As far as the application of intellect for PVE and PVP, more is better!
I know that this is all pretty basic information but remember we must first establish the basics and then we can get into the more fun aspects of being a holy Paladin. Tomorrow we will take a look at the second statistic that is going to be imperative, and I promise it will be somewhat more Indepth (if that is possible for the basics).