( Copy from the US forums ) You must have completed the Neltharku series of quests to get neutral with netherwing, have 300 riding skill, and (maybe) completed the Teron Gorefiend questline.
The first quest starts at Mordenai in Netherwing fields, from there he sends you to talk to the leader of the Dragonmaw orcs. The Orcs base is on Netherwing ledge right on the E for netherwing. Once you get there you get several quests "A slow Death" (daily)-250 rep.
Get Fel glands from the netherskates around netherwing ledge and use them to poison the dragonmaw peons. Netherdust pollen (herbalist)- collect 40 netherdust pollen and turn them in, I'm assuming there is an equivalent quest for every gathering profession-250 rep.
Netherwing crystal (daily)- collect 40 netherwing crystals from the flayer mobs on the island-250 rep Great Netherwing Egg Hunt (repeatable)-very rarely you'll find a netherwing egg (I've found 2 so far, both off of herbs). The first one you turn in is worth 385 rep (human) and all turned in afterwards are 275 human rep
Not so friendly skies (daily)-fly to the path between netherwing ledge and netherwing fortress and kill the mobs flying past to get 10 quest items to turn in-250 rep
All Daily quests are repeatable once a day, and you can do 10 a day maximum. As you gain a higher standing with the faction the number of quests you can do increases, with the new quests giving more rep per turn-in. It's still not really very clear, but we do know it's a long grind and not a Tier 0.5 type quest chain.