Mebbe this first:
http://www.wowinsider.com/2008/12/08/spiritual-guidance-hitting-the-cap/

Here's their recommended gear to get hit-capped.  You don't need to fill each slot, these are just options to make it easier for you.  Get hit-capped, then it will be easier to dps, then it will be easier to do Heroics and then Raids.  Enjoy.

Chest

• Ebonweave Robe
• Turtle-Minders Robe
• Robes of Lightning
• Water-Drenched Robe

Feet (none, sorry)

Hands

• Lava Burn Gloves
• Ebonweave Gloves

Head

• Hat of Wintry Doom
• The Argent Skullcap

Shoulders (none, sorry)

Waist

• Sash of the Wizened Wyrm
• Flowing Sash of Order
• Belt of Unified Souls
• Plush Sash of Guzbah
• Girdle of Bane

Wrists (none, sorry)

Neck - Necklace of Taldaram

Finger

• Ring of Northern Tears
• The Prospector's Prize

Trinket

• Mark of the War Prisoner

Wands

• Ancient Measuring Rod
• Wand of the San'layn

Weapons

• Zabra's Misplaced Staff
• Flameheart Spell Scalpel (1Hander)
• Telestra's Journal (Offhand)
• Ward of the Violet. Citadel (Offhand)