As with Jewelcrafting, Alchemy is a bit more nuanced than looking at hourly rates. Flasks will provide you with a good baseline, but if you carefully watch the market and plan your transmutes with market trends, you could see huge gains like JC. Assuming you are focusing only on selling Flasks, you will make around 2138 gold/hour if you are also an Herbalist.
Mag'har orc - "For untold generations, the orc clans of Draenor battled one another in endless war. But when Gul'dan offered them the blood of his demonic masters, the disparate tribes of Mag'har—the orcish word for "uncorrupted"—refused the dark bargain and banded together to drive out the Burning Legion. United under the leadership of Grommash Hellscream, the Mag'har pledged to one day repay Azeroth's heroes for aiding their cause. As war against the Alliance intensifies, the Horde must call upon the might of the Mag'har to seize victory."
The Horde will now control most of Kalimdor, and the Alliance most of the Eastern Kingdoms. For a low-level character the quests and storylines won't change, but for high-level players many zones will see changes via phasing. Teldrassil is burned and Undercity is in ruins as the story progresses by phasing. At max level Arathi Highlands and Darkshore are phased to be updated to reflect their status as locations for Warfronts.
Yes, that is easy, but it's not quick. Further down in my comments to OP I detailed the GIO farm, and reasonable yield expectations. I looked up a few guides/videos before commenting and most of them estimate a yield beween 800-1,000 GIO/hour. That lines up with my past experience with it as well. That'd be, taking the high yield end, 4.2 hours to farm the GIO for one toon's monthly needs.
REALM FORUMS Defias Brotherhood / Ravenholdt et al. Shattered Halls / Sunstrider et al. Twilight's Hammer / Agamaggan et al. Aerie Peak / Bronzebeard Aggra / Grim Batol Aggramar / Hellscream Al'Akir / Skullcrusher / Xavius Alonsus / Anachronos / Kul Tiras Arathor / Hellfire Argent Dawn Aszune / Shadowsong Auchindoun / Dunemaul / Jaedenar Azjol-Nerub / Quel'Thalas Azuremyst / Stormrage Blade's Edge / Eonar / Vek'nilash Bladefist / Frostwhisper / Zenedar Bloodfeather / Burning Steppes / Executus / Kor’gall / Shattered Hand Bloodhoof / Khadgar Bronze Dragonflight / Nordrassil Burning Blade / Drak’thul Burning Legion Chamber of Aspects Darkmoon Faire / Earthen Ring Darksorrow / Genjuros / Neptulon Darkspear / Saurfang / Terokkar Doomhammer / Turalyon Draenor Dragonblight / Ghostlands Dragonmaw / Haomarush / Spinebreaker / Stormreaver / Vashj Emerald Dream / Terenas Frostmane Kazzak Kilrogg / Nagrand / Runetotem Lightbringer / Mazrigos Magtheridon Moonglade / Steamwheedle Cartel / The Sha'tar Outland Ragnaros Ravencrest Silvermoon Stormscale Sylvanas Tarren Mill / Dentarg The Maelstrom / Deathwing / Karazhan / Lightning's Blade Thunderhorn / Wildhammer Twisting Nether
Disagree with your comments on Sky Golem. You need about 4200 ghost iron ore make this. Ghost Iron ore turns into bars which are used for Jard's Power source, but you only need 300 bars for that. You also need living steel which is transmuted from triullium, which in turn is transmuted from ghost iron. If you have an transmute master you proc on average about 20 additional trillium bars, that's like 7000g in savings.
Enchanting, Jewelcrafing and Alchemy are also good quality choices no matter what the expansion is because potions, elixirs, flasks they are always needed which made by Alchemists. Then we have enchanting pretty much the exact same thing with alchemy. There is no expansion where people would not need enchants. Then we have jewelcrafting once again same thing, stat gems which always go for a fair price in Auction House. Also this profession synergizes with mining and making good profit by only purchase and prospecting ores.
All of my gold came from everyone buying stuff at a really marked up price for instance BS 2h mace if it proced epic i was making at least 125k per one and i was making batchs of 10 to 15 it was like 25k for blue and 125k+ for epics at the time. And i was buying the ore for like 16g to 40g a pop so huge profit. Im still trying to figure out what im gunna do now to rebuild it will be a slow process now.