This is a guide for high level Engineers who want to make big amounts of gold, all you need is an Engineering level of 305. What you do is a get a Zapthrottle Mote Extractor either by making one or having another engineer make it for you. After getting the Mote Extractor, I recommend you getting an item that has a “Equip: Shows the location of all nearby gas clouds on the minimap” effect on it – I use Furious Gizmatic Goggles.
After obtaining those items, equip your Goggles (or whatever item you’re using) and fly around Nagrand to the “Windy Clouds” your Goggles point you to (they will be shown as dots on the minimap) and use your Mote Extractor to get 3-5 Motes of Air from each cloud. With my Gyrocopter, I average 14 Primal Airs an hour – the average price on the AH is 25g so thats 350g an hour just by flying around Nagrand

In all honesty, there’s not much you can do to prepare for the Wrath of the Lich King Expansion except for saving up your gold and most importantly – tradeskill materials . Why Tradeskill materials? Well I expect that Blizzard would be raising the profession caps (note: I am not sure about this, just a speculation), this means that many people would need tradeskill materials to powerlevel their professions as most characters have 2 non-gathering professions (eg. Jewelcrafting and Engineering). So what I suggest you do is stock up some high-end materials:
The demons at the Forge Camps in Hellfire Peninsula were my favorite mobs to farm on, especially the demons at Forge Camp: Rage; Forge Camp: Magedonn wasn’t too bad as well. The only downside with these demons are that they hit quite hard for their level, that’s why I recommended you the