1) This reputation grind is the same for both factions and can be completed in fewer than 14 days. To start, you have to travel to Shadowmoon Valley of Outland and find Mordenai. You can type “/tar mord” in the chat to try to target him without having to look for this NPC manually. Make sure to have the maximum flying skill before you go there.
2) He will offer you a quest “Kindness” that starts a fairly straightforward quest chain that will unlock an area filled with daily quests. At this point you want to stay in the Netherwing Ledge area and complete all available daily quests. At each new point of reputation (i.e. at honored, revered) more daily quests will become available.
Simply continue completing dailies until you max out the reputation.
3) The grind can be sped up by gathering and turning in Netherwing eggs (corresponding quest is unlocked during the quest chain). The eggs are turned in to a goblin named Yarzill the Merc for a bonus 250 rep per egg.
Netherwing eggs randomly spawn in the marked area (including the underground mine!), but can also sometimes drop from creatures.
Thus, you could spend a little bit of extra time in the area looking for eggs after you are done for the day, but don’t expect to find many as people still grind this reputation, especially on high-populated realms.
Eggs can also drop from mobs in Netherwing Ledge on a low (1%ish) drop chance, some people setup farm groups to kill mobs and grind the eggs. Alternatively you can also get 1-3 Netherwing Eggs per week from Netherspite in Karazhan
4) Once you reach exalted, you will be given a final quest – Lord Illidan Stormrage that culminates in Shattrath and let’s you pick one of the Netherwing Drakes for free. It is a good idea to buy all other drakes you might want to get from Drake Dealer Hurlunk before you start the quest to avoid having to return all the way back from Shattrath.
Hurlunk is found near the main building of the orc camp.
Extra Tips: Humans receive 10% extra reputation from all sources due to their racial buff. Additionally, countless reputation buffs can be utilized to speed up your reputation gains further, such as the Darkmoon Faire Buff (DMF is around for one week every month), WOW Anniversary buff or other mini-holiday related buffs such as Hollow’s End one.