What I did was I single box my pally first and join guild/pug 5man heroics and 10/25man raids. The next thing I know my pally already have decent gear for tanking and healing. I started out Holy then whenever the tank has a better gear than the drop then it goes to me. Be wise also in purchasing items from heroic emblems.

I use this as my guide when I started dressing up my tank



Armor:

Head
#Valorous Scourgeborne Faceguard - T7.5
#Helm of Vital Protection - ?
#Heroes' Scourgeborne Faceguard - T7
#Thane's Tainted Greathelm - 4 Horsemen, Naxx10
#Tempered Titansteel Helm - Blacksmithing
#Armored Titanium Goggles - Engineering (req. Engi 400)
#Arcane-Shielded Helm - Grand Magus Telestra, The Nexus (H)
#Ground Tremor Helm - Moorabi, Gundrak (H)
#Helm of the Ley-Guardian - Cache of Eregos, The Oculus
#The Crusader's Resolution - Quest, Icecrown
#Tempered Saronite Helm - Blacksmithing


Neck
#Boundless Ambition - Kel'thuzad, Naxx25
#Amulet of Autopsy - Heigan the Unclean, Naxx10
#Chained Military Gorget - 25xEmblem of Heroism
#Heritage - Several Bosses, Naxx25
#Titanium Earthguard Chain - Jewelcrafting
#Pendant of the Nathrezim - CoT Stratholme (H)
#Shadowseeker's Pendant - Jedoga Shadowseeker, Old Kingdom
#Reinforced Titanium Neckguard - Quest, Icecrown
#Amulet of Deflected Blows - Skadi the Ruthless, Utgarde Pinnacle
#Amulet of Wills - Sjonnir the Ironshaper, Halls of Stone
#Torta's Oversized Choker - ?
#Betrayer's Choker - Quest, Zul'drak


Shoulders
#Valorous Scourgeborne Pauldrons - T7.5
#Pauldrons of Unnatural Death - Anub'Rekhan, Naxx25
#Heroes' Scourgeborne Pauldrons - T7
#Abomination Shoulderblades - Patchwerk, Naxx10
#Wapach's Spaulders of Solidarity - World Drop
#Iron Dwarf Smith Pauldrons - General Bjarngrim, Halls of Lightning (H)
#Crusader's Square Pauldrons - Trash, CoT Stratholme
#Pauldrons of Reconnaissance - Quest, Halls of stone
#Glimmershell Shoulder Protectors - Oracles, rep?


Back
#Cloak of the Shadowed Sun - Various Bosses, Naxx25
#Platinum Mesh Cloak 25xEmblem of Valor
#Cloak of Armed Strife - Maexxna, Naxx10
#Gale-Proof Cloak - OS10
#Cloak of the Enemy - Optional Bosses, Nexus
#Cloak of Peaceful Resolutions - Wyrmrest Honored
#Flowing Cloak of Command - Salramm the Fleshcrafter, CoT Stratholme


Chest
#Valorous Scourgeborne Chestguard - T7.5
#Breastplate of Tormented Rage - Heigan the Unclean, Naxx25
#Dragonstorm Breastplate - OS10, 3 adds up
#Heroes' Scourgeborne Chestguard - T7
#Massive Skeletal Ribcage - Sapphiron, Naxx10
#Ziggurat Imprinted Chestguard - The Prophet Tharon'ja, Drak'tharon Keep (H)
#Sun-Emblazoned Chestplate - Sjonnir The Ironshaper, Halls of Stone (H)
#Breastplate of the Solemn Council - Wyrmrest Revered
#Reanimated Armor - Gortok palehoof, Utgarde Pinnacle
#Silver-Plated Battlechest - Quest, Utgarde Pinnacle
#Tempered Saronite Breastplate - Blacksmithing
#Agin's Crushing Carapace - BoE drop


Wrist
#Bracers of the Unholy Knight - Naxx25
#Bracers of Dalaran's Parapets - 60xEmblem of Valor
#Minion Bracers - Trash, Naxx10
#Bracers of the Herald - Herald Volazj, Old Kingdom (H)
#Bindings of Dark Will - Salramm the Fleshcrafter, CoT Stratholme (H)
#Svala's Bloodied Shackles - Svala Sorrowgrave, Utgarde Pinnacle
#Tempered Saronite Bracers - Blacksmithing


Gloves
#Valorous Scourgeborne Handguards - T7.5
#Callous-Hearted Gauntlets - Grand Widow Faerlina, Naxx25
#Heroes' Scourgeborne Handguards - T7
#Gauntlets of the Master - Grand Widow Faerlina, Naxx10
#Fireproven Gauntlets - Kirin-Tor Exalted
#Horn-Tipped Gauntlets - Gal'darah, Gundrak (H)
#Gauntlets of the Water Revenant - ?
#Daunting Handguards - Blacksmithing
#Gauntlets of Vigilance - Quest, The Storm Peaks
#Tempered Saronite Gauntlets - Blacksmithing


Waist
#Ablative Chitin Girdle - ?
#Waistguard of Living Iron - 40xEmblem of Heroism
#Ancient Aligned Girdle - Anub'arak, Azjol Nerub (H)
#Waistguard of the Risen Knight - ?
#Girdle of Obscuring - Mage Lord Urom, The Oculus
#Tempered Saronite Belt - Blacksmithing


Legs
#Legplates of Sovereignty - Malygos25
#Valorous Scourgeborne Legguards - T7.5
#Dragon Brood Legguards - ?
#Heroes' Scourgeborne Legguards - T7
#Bolstered Legplates - Cyanigosa, Violet Hold (H)
#Legplates of the Infinite Drakonid - Chrono-Lord Epoch, CoT Stratholme (H)
#Ley-Guardian's Legguards - ?
#Special Issue Legplates - Argent Crusade Honored
#Daunting Legplates - Blacksmithing