Many things are payable in-game with WoW gold such as travelling through continents, buying mounts or new equipments. As the players are progressing in the questchains, they might face gold issues so they might need to learn Primary and Secondary professions to get some income by collecting Herbs, Skins or other raw materials what they can sell or just simply buy WoW gold from us - it's always the easier way out. There is a possibility to trade with other players face to face, in-game mail, or auction house, however the most valuable items can be Soulbound which means that they are cannot be traded once a player Bind it to him/herself. The biggest part of the trades are going through the Auction house where players can trade their goods between each other after paying the listing fee and the auction house tax.
Patience and extra gold are rather important for the mounts so it might not be best for you right now. As for the operation (Wrath and Pandaria mounts right now), you need a miner (ore is cheaper than bars), transmutation master alchemists (living steel and some time eternals for daily cooldown, titanium and riddle of steel), and potentially multiple engineers (for more Sky Golems, plus at least one gnomish and one goblin if you want to do both rockets). The best way to source Pandaria mats cheaply is to buy up Spirit of Harmony when it's cheap and check often for mats cheaper than the conversion rate (1 Spirit buys 20 ghost iron ore, 5 trillium ore, 20 Kyparite, and more). Same with Eternals (for crafting titansteel)...you have to regularly check and grab them up whenever they're cheap (frozen orbs can be exchanged for eternals in old Dalaran too so watch for some cheap orbs as well). I also sell Golden Lotus on the side since it goes for more than the Spirit cost. (Edit: Also should point out that at the end of the expansion everyone is bored with nothing better to do so the profits on the mounts have dipped to as low as 5k.)
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