Browsing the AH is and may regularly be helpful, because it offers you the chance to understand around the specific prices and economy in your server. Before long you can find and get really under-priced stuff, to trade it for any better price, providing a nice profit. It might actually help you to get your Epic Mount.
BC (Burning Crusade) came out. Most likely, you can see that you've a great deal of 'primal' stuff on offer with the AH. These items are needed for up to every profession above 300. You need to farm motes in order to get those. (Especially elementals drop these.) On my server, the primal Fire is one of expensive one, which is easily farmable to be a level 70 in Shadowmoon Valley.
Based on your server and local economics, you'll usually be able to sell them for a nice 30-40g each. Pursue the Blood Elfd in Netherstorm, as they'll drop both Scryer Wow Gold , and many Nether Weave. It's going to naturally consist of class to class which mobs could be the easiest to grind, and I personally prefer an affliction lock for the position, your own experience might prove otherwise of course.
Some final words of recommendation: continue to keep on top of the Ah with a special bank character, do your economics, farm primal and Nether Weave or reputation items with your main character, and acquire rich!