I agree with Protection Warrior if Horde but if Alliance I would do Protection Paladin.
I also agree with Hardcore Scape's gear recommendations and had put the following together for Protection Paladins (some of which is also valid for Protection Warriors):
https://docs.google.com/spreadsheets...#gid=296552331
Note: The above spreadsheet has quite a bit but is still a work in progress...
Note that Protection Paladins can have multiple paths toward the same goal... One often recommended path is to go max defense with something like the Deathbone Guardian set though some of the best talents in the Protection Paladin tree activate when the Paladin is crit (like +30% Block from Redoubt & extra attacks via Reckoning) and defense lessens crits so another option is to go for max armor/stamina and not worry as much about defense (especially when the mobs are low level). Some people focus on spell damage which can be significant though you are getting into Bind on Pickup (BoP) Raid gear for the good stuff and the BiS list above is more dungeon or BoE gear (though some pieces are from Raids)...
The Force Reactive Disks are great but very expensive to make and keep repaired (and you need 2 or 3 as they break so often) so another option that can be looked at is the Argent Defender which gives a chance for +50% block on hit and coupled with Blessing of Sanctuary and Thorium Shield Spike should be putting out quite a bit of damage/mitigation (about 60 damage with each block). With lots of low level mobs hitting you you should have good uptime on both the shield's +50% Block & +30% Block (from Redoubt talents) for some really nice reflection/mitigation (that is a crazy +80% Block on top of normal block). You can also get another +30% Block (to go >100%) from Holy Shield but it is only for 4 blocks every 10 seconds (has a hard cool-down), is mana intensive, and precludes you going very deep in the Holy Tree so it is hard to justify if you want to also Raid heal from a single spec.
For Paladin self healing while AoE tanking the Hand of Edward the Odd gives you instant cast deep heals and Uther's Strength trinket procs (coupled with the boosted Priest alt's Power Word Shield) also give you enough respite for heals often (especially against lower level mobs). You should map a key such that when Uther's Strength procs you simultaneously cast both shield from the Priest and heal from the Paladin...
For motivation:
Video on The POWER of Prot Paladin Dungeon Farming in Classic WoW
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