Please note that these quests are extremely difficult, and should not be attempted until your character is level 60. More importantly, the majority of these quests cannot be raided. You should still group as much as possible, but within the confines of a standard group.
The Alliance Key Chain
Step 1: Talk to Helendis Riverhorn
http://www.thottbot.com/?n=6404
Helendis Riverhorn begins the Alliance Key Chain. He is a Night Elf NPC in Morgan's Vigil, in the northwest corner of Burning Steppes.
Step 2: Dragonkin Menace
http://www.thottbot.com/?q=1237
Helendis will give you a quest requiring you to kill 15 Black Broodlings, 10 Black Dragonspawn, 4 Black Wyrmkin and 1 Black Drake. They can be found all around Burning Steppes, so just start killing stuff and you'll finish quickly. Return to Helendis when you have finished.
Step 3: The True Masters, Part 1
http://www.thottbot.com/?q=1232
Helendis will give you a letter, which you must deliver to Magistrate Solomon in Lakeshire Townhall, which is in Redridge.
Step 4: The True Masters, Part 2
http://www.thottbot.com/?q=1227
Magistrate Solomon will give you another letter, which you must deliver to Highlord Bolvar Fordragon in Stormwind Keep.
Step 5: The True Masters, Part 3
http://www.thottbot.com/?q=1229
Bolvar will give you another letter, which you must delivery to Magistrate Solomon back in Redridge.
Step 6: The True Masters, Part 4
http://www.thottbot.com/?q=1228
Magistrate Solomon will now send you to Marshall Maxwell, who is back in Morgan's Vigil in Burning Steppes where Helendis is.
Step 7: Marshal Windsor
http://www.thottbot.com/?q=1209
Marshall Maxwell will tell you to speak with Ragged John, who resides near a cave in the northern area of Burning Steppes. Follow Ragged John's instructions, and you will be sent back to Marshal Maxwell. Maxwell will now send you to Blackrock Depths, where you must find Marshal Windsor.
Marshal Windsor is not hard to find, he is not far into the dungeon. To your right as you enter there is a prison area; Marshal Windsor is inside one of the cells.
Step 8: Abandoned Hope
http://www.thottbot.com/?q=2053
Windsor will send you back to Maxwell. Do so, and the quest chain will seem to come to an end. But you are far from done; you must return to Blackrock Depths for the next part of the quest.
Step 9: A Crumpled Up Note
http://www.thottbot.com/?q=21225
In Blackrock Depths, you must now start killing random MOBs. One of them will drop a Crumpled Up Note, which you should take to Marshal Windsor ASAP.
Step 10: A Shred of Hope
http://www.thottbot.com/?q=1909
Windsor will now send you to kill General Angerforge and his Golem Lord, Argelmach. One of them will drop Marshal Windsor's Lost Information, which you should take to the Marshal ASAP.
Step 11: Jail Break!
http://www.thottbot.com/?q=13071
Now, you must escort Marshal Windsor out of Blackrock Depths. It is highly recommended that a strong tank and several healers be present; Windsor draws a shocking amount of aggro, and will need the backup. Once you make it out of the instance and the escort is completed (Windsor will say when you have gone far enough), return to Marshal Maxwell in Morgan's Vigil.
Step 12: Stormwind Rendezvous
http://www.thottbot.com