Short term raw material flipping. I think there is a thread up here about it atm actually. If you are buying to hold for more than a week you're opening yourself up to a lot of risk. Buy in the morning and sell at night, and/or buy on the weekend to sell during the week if you have a decent raid population on your server. Start with something you understand, sell from that market and then expand.
There are also numerous gold-making guides available for World of Warcraft players. Currently mmobux recommends Killer Guides' World of Warcraft Gold Guide, which covers a broad range from daily quests and professions to making gold while leveling and auction house trading. 'Standard' farming spots are covered as well, making it an interesting resource for bots as well. Yielding up to 500 gold per hour, the strategies are suitable for players of all skill levels. If Killer Guides keeps the guide up to date, it probably will become a valuable resource for professional farmers as well. There also seems to be a German-language version available: WoW Gold Guide (German)

 Dark Iron dwarf - "Known for their fiery tempers and fierce determination, Dark Iron dwarves have a turbulent history with the other clans. A failed coup in Ironforge ignited the War of the Three Hammers, and many of the Dark Iron once fought in the service of Ragnaros the Firelord. Though one faction is pledged to Queen-Regent Moira Thaurissan, others refuse to stand alongside their kin. The Alliance seeks a united Dark Iron clan to harness the power of Azerite and aid their struggle against the Horde."

Inscription – This one deserves its own category. I recently got back into this profession and I think it can make some serious gold at all levels due to how glyphs work now. On the flip side, glyphs are cosmetic one time uses only and the market can be really slow for the less interesting ones. I also recently installed TSM and I think you need some kind of addon like this to manage your production and sales if you are going to be in the glyph market. BfA is also keeping the tomes and adding in new reputation contracts so that could also provide a steady income.
For what it's worth, I like the leveling changes, but I also think that the profession changes are beneficial. Once they removed the utility of most professions; it became more of a hobby. Crafting should be fun. When it gave perks, it was fun, but Blizz, correctly, decided that it was creating forced gameplay (min/maxers always picked certain profs). So they changed it. Well when a prof doesn't give you any gameplay perks AND it's's not fun. Especially if you're starting from scratch and outleveling your profs because you're blowing through levels so quickly.
Island expeditions require groups of three players to venture to islands with randomly spawned enemies and piles of AP. The island expedition ends once they collect a certain amount of AP, and they are granted about 300 AP as a reward — unfortunately, players don’t get any of the between 6,000 and 12,000 AP they collect during the expedition. These missions can take anywhere from three to 20 minutes, and never once offer any real challenge or depth.

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.