The Spirits are saying that I need to make a Shaman post.

Ok, the spirits aren't telling me to, but Hazmat is, so I will concede him this wish. Ah. the mighty Shaman, powerful spiritual warrior and master of the 4 elements. Truly a valued dungeon/raid companion if there was one. The Shaman's utilization of various combinations of totems, and the ability to use Heroism/Bloodlust (Respectively) is an irreplacable asset.
Now don't get me wrong here, I'm not going to say that's all Shamans are good for, of course not. The Shaman has some decent capabilities in the area of dps, and makes an excellent healer for raid members (not to imply they can't MT heal) for melee especially.

Restoration:
Restoration Shamans are sort of self explanatory as far as their ability usage goes, so I don't really need to get into that right now. What I will give you is the talents for said spec.
http://www.wowhead.com/?talent#hZ0xxIZx0ezIeoxkrIRt:0as

Elemental:
Lightning Bolt! Lightning Bolt! Lightning Bolt!
Sorry, had to get that out of my system. Anywho, the Elemental tree is the Shaman's caster dps specialization. It offers a fairly good fire totem to use as well, the Totem of Wrath, which increases the critical strike chance against all targets nearby by 3%, and provides 280 spell power to all raid members.
Rotation for said spec is as follows, Cast Flame Shock and make sure it never falls, Lava Burst whenever it is off cooldown, Chain Lightning, and Lightning Bolts when everything else is on cooldown. Use Elemental Mastery in conjunction with Heroism/Bloodlust for best effects, and use Thunderstorm as a nice mana pot as you normally won't be close enough to the boss to dmg it with the spell. If you are however, blast 'em whenever you can with it.
http://www.wowhead.com/?talent#hEh0qbzItGfzAohxxco:kMbocM

Enhancement:
A great fusion of Melee and Spell, the Enhancement Shaman. Now obviously you wanna use 2 slow one handed weapons for this, period. Your weapons should have Windfury on the Main-hand, and Flametongue on the Off-hand. Because of the Static Shock talent (chance on hit to set off one of your Lightning Shield orbs against your opponent) you will use Lightning Shield. For rotations, you should use Stormstrike, Flame Shock, Earth Shock, and Lava Lash. When your Maelstrom Weapon effect reaches 5 stacks, unleash a Lightning Bolt. Shamanistic Rage and Feral Spirit whenever you can.
http://www.wowhead.com/?talent#hi0hqZbxxIoxzIhusRuVo:kNwmcM

Well, I hope you thoroughly enjoyed reading about how to Shaman. Any questions and/or requests feel free to ask.