I got a lucky 350 BoE drop just after hitting 120 about 48 hours after the expansion launched. Was able to sell it for 400k. I had chosen an alt on a different faction as a main this expansion, so I was glad to have more than the 25k I’d previously had. A couple days later I saw another 350 on the AH for 50k and flipped it for 300. That plus farming Monelite Ore as I do World Quest has me sitting on about 1mil.
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.)
The Alliance are able to unlock the void elves (exiled blood elves who can tap into shadow magic, trained by Alleria Windrunner after her experiences on Argus), Lightforged draenei (draenei members of the Army of the Light who fought the Legion on Argus), Dark Iron dwarves (fire-blooded cousins of the in-game dwarves of Ironforge), and Kul Tiran humans (larger, more heavyset versions of the in-game humans of Stormwind).
I think that's server dependant. I make a lot of Golems, but the price on my server is high enough that you could buy all the living steel and still make about 20K (almost 200kg on AH). Its just that you proc all the way up the chain. You proc 20% of your trillium, and then 20% of your living steel. SoH and Ghost Iron are such low effort farms, too. 20% of 180 Trillium Bars at 500g is 18k more profit, 20% of 150 Living Steel at 3500g is another 105kg. That's an extra 25k profit per Golem. If they stop selling stockpile them for the next expansion, they always boom with the price of herbs. And a consistent 20% proc rate is the opposite of RNG, its extra free stuff as a benefit to completing an extra quest (not to mention for new alchemists the investment of leveling Vanilla Alchemy). You're looking for some get rich quick scheme, where the real way to build wealth is patience and volume. No market is going to be viable because you want it to be. Only because you make it viable.