The Undercity is the capital city for the Undead. It is built under the ruins of Lorderan.
You find the Fire Launcher in World of Warcraft by going to Orgrimmar or Undercity. They all have them!
an hour
No, I have not ventured into the undercity in the world of Magic: The Gathering.
Sylvanas is the leader of the Forsaken. She was once Lady Sylvanas Windrunner, a general for the high elf army, but was converted into a banshee by Arthas when the Scourge invaded Silvermoon. You can find her in the Undercity.
Varian Wrynn can be found at the throne room in the Keep of Stormwind. He also features at the quest for Battle of the Undercity, and is standing in the starting hall of Icecrown Citadel.
If you are just starting out, not really, you just have to do all the quests that give Under-city reputation. If you are 78-80 you can do the argent tournament quests that will get you exalted fairly quickly.
Depends on whether you are Horde or Alliance - Alliance learn them from their trainer in the Slaughtered Lamb in Stormwind or you can get an imp in Northshire after the quest 'The Stolen Tomb', or in the 'bad area' of Iron Forge. Horde, the trainer in Undercity or Ogrimaar.
There is no such thing as World of Warcraft: The Frozen Throne. It is called Warcraft 3: The Frozen Throne. World of Warcraft is much different.
As a Mage you can teleport to major cities. You should have the spell to teleport to Stormwind or Undercity (I'm not sure about UC as I play Alliance.) and there is a trainer there. Or are you asking where to level your Mage? If so, Horde or Alliance? PVP or PVE Server?
World of Warcraft is set in Azeroth...
yes, you can swim in world of warcraft
World of Warcraft happened in 2004.