Quest Line Two: The Broken Front
Turn in 15 and then accept 17, finishing it together with 15 and then Turn in them
When finished, it turns to be daily quest
Quest Line Three: Aldur'Thar:The Gate of Desolation
Finish 18 you may accept 19 and 20. These two are daily quests. 17.18.19 are all bombing mission by using flight mount.
Now please come back to Orgrim's Hammer and you can accept 21/22 which can be finished at the same area.
Turn in 21/22 and you can accept the following two quests which can be done at the same area.
All the following four quests can be finished at the same area
This is a 5-person team quest.The following three quest can be done at the same area.
This is a 5-person team quest.Quest Line Four: Icecrown Citade l. You can accept quest (33) Opportunity at Orgrim's Hammer and trigger the following quests.