Once you hit level 60, you will want to head to Outlands and align yourself with either the Aldors or Scryers. The rewards are very similar so it is more of a personal choice than anything else. This is the WoW Aldor Rep Guide. I will try to keep this as short and straight forward as possible.
Just a few notes before we start:
o All races will start out as neutral with Aldor unless you are a Draenei (Friendly) or Blood Elf (Hostile).
o For every reputation gains with Aldor will result in 10% more loss of reputation with the Scryers. (eg: +100 Rep to Aldor will result an automatic -110 Rep to Scryer)
Neutral – Honored (Do Not Do The Non-Repeatable Quests Yet)
o Turn in 10xMarks of Kil’Jaeden to Adyen the Lightwarden in Aldor Rise will result in +250 Aldor Rep. You can find these Marks from lower level Burning Legion mobs. There is a camp in the Bone Wastes in Terokkar Forest. These Marks are usually readily available in Auction House, sometimes you can catch them at a bargain.
Honored – Exalted (Do the Quests Now)
o Higher-level Burning Legion mobs drop Marks of Sargeras, turning in 10 of those will get you +250 Rep to Aldor. These higher level mobs will occasionally drop Fel Armaments which can be turned in for +350 Rep each. It takes 33000 Rep to reach Exalted from Honored.
o Unless you have tons of gold to invest, it’s best to farm these Marks and Armaments.
Quests – These are only startup quests
o  A’dal
o  Assist Exarch Orelis (Long Quest Chain)
o  Against the Legion
o  Karabor Training Grounds
o  The Ashtongue Tribe
o  Tablets of Baa’ri
o  Return to the Aldor
Finishing the above quest chains will result in +11520 Aldor Rep. Hopefully this guide is straight forward and made grinding Aldor Reputation easier for you.