This is a guide that is meant to gear up an Enhancement shaman for Karazhan quickly and easily. Step 1 is the most desirable, with each descending step an alternative.
Head:
1. Grab a Mask of Veiled Death (Mask of Veiled Death - Item - World of Warcraft) from the Auction House
2. Run Normal Auchenai Crypts and get the Darkguard Face Mask (Darkguard Face Mask - Item - World of Warcraft). This item provides similar DPS, but also gives a helpful stamina boost
Neck:
1. Buy a Necklace of Trophies (Necklace of Trophies - Item - World of Warcraft)from the Auction House
2. Run Normal or Heroic Botanica for the Jagged Bark Pendant (Jagged Bark Pendant - Item - World of Warcraft)
Shoulders:
1. Run Normal or Heroic Durneholde for the Mantle of Perenolde (Mantle of Perenolde - Item - World of Warcraft)
2. Buy the Talbuk Hide Shoulders (Talbuk Hide Spaulders - Item - World of Warcraft) if Horde, buy the Blackened Leather Spaulders (Blackened Leather Spaulders - Item - World of Warcraft) if Alliance. These are better than the #1 option, however much more difficult to obtain
Back:
1. Run Normal or Heroic Shadow Labyrinth for Cloak of the Inciter (Cloak of the Inciter - Item - World of Warcraft)
2. Buy Cloak of the Craft (Cloak of the Craft - Item - World of Warcraft) from the AH
Chest:
1. Buy Chestguard of the Dark Stalker (Cloak of the Craft - Item - World of Warcraft) from the AH
2. Run Normal Blood Furnace for Vest of Vengeance (Vest of Vengeance - Item - World of Warcraft) Note: Put 3xBold Living Ruby in this chestpiece and it can be very competitive with Kara epics
Wrists:
1. Run Normal Underbog for Lykul Bloodbands (Lykul Bloodbands - Item - World of Warcraft)
2. Run Normal Ramparts for Bracers of Finesse (Bracers of Finesse - Item - World of Warcraft)
Hands:
1. Run Normal or Heroic Black Morass for Handgrips of Assassination (Handgrips of Assassination - Item - World of Warcraft)
2. Buy Fel Leather Gloves (Fel Leather Gloves - Item - World of Warcraft) and put in 1xBold Living ruby and 1xInscribed Noble Topaz
Waist:
1. Run Normal Slave Pens for Tracker's Belt (Tracker's Belt - Item - World of Warcraft)
2. Buy Sash of Silent Blades (Sash of Silent Blades - Item - World of Warcraft) from the auction house
Legs:
1. Kill Ogres in BEM to get Thunderlord Clan Artifact (Thunderlord Clan Artifact - Item - World of Warcraft), do the quest chain, and get the Clefthoof Hide Leggings (Clefthoof Hide Leggings - Item - World of Warcraft). It's a long chain, but -very- much worth it
2. Run Normal or Heroic Shadow Labyrinth and get Leggings of Assassination (Leggings of Assassination - Item - World of Warcraft)
Feet:
1. Buy The Master's Treads (The Master's Treads - Item - World of Warcraft) from the AH
2. Do the quest "Natural Remedies" (Natural Remedies - Quest - World of Warcraft) for the Studded Green Anklewraps (Studded Green Anklewraps - Item - World of Warcraft)
Fingers:
1. Run Normal or Heroic Sethekk Halls for the Ravenclaw Band Ravenclaw Band - Item - World of Warcraft)
2. Buy Pathfinder's Band (Pathfinder's Band - Item - World of Warcraft) from the AH
Trinkets:
1. Run Normal or Heroic Mechanar for Abacus of Violent Odds (Abacus of Violent Odds - Item - World of Warcraft)
2. Run Normal or Heroic Black Morass for Hourglass of the Unraveller (Hourglass of the Unraveller - Item - World of Warcraft)
Weapons:
1. Run Normal Magister's Terrace for Sun-forged Cleaver x2 (Sun-forged Cleaver - Item - World of Warcraft)
2. Buy Fist of Reckoning x2 (Fist of Reckoning - Item - World of Warcraft) from the AH
Totem:
1. Run Normal Underbog for Totem of the Thunderhead (Totem of the Thunderhead - Item - World of Warcraft)
2. Buy Totem of Impact (Totem of Impact - Item - World of Warcraft) for 15 marks of Thrallmar / Honor Hold
After gearing up, assuming you chose the first option in each item slot: 70 Troll Shaman
That's 998 AP, 23.83% crit chance, and 149 hit rating. If you use the talent tree at the bottom of the link, you will be good to go for Kara!