Honestly TL:DR of any guide. Is learn your markets, it's as simple as that. Learn who's in it, learn what's profitable, watch different time tables. I've earned 2 million profit OFF 1 market and half set up TSM. I've barely tried before this I was a hardcore raider, only made gold over the years through BOE farming and run sales (which are goood, don't get me wrong) but I want to be making the multiple gold capped characters.
Not improvements on audio, as expected. These are intended to make your speaker connections look more "professional" and easier to manage. If you are an audio freak like me (changing and switching cables all the time just to get the most from my equipment) you'll appreciate these. A little "plastic" look but does the trick very well. The screws are great when it comes to get the cables tighten to the plugs. Recommended.
Professions have changed dramatically in Legion. While before you simply had to pay for recipes when you were in town, now the trainers as you to gather certain materials or defeat certain targets in order to unlock additional recipes. How can you profit from this new system? Well, to compensate players with the harder recipe unlocks, the developers have implemented a recipe rank system.
The hexweave bags are still a safe bet unless the new 32 crafting cost is like 10% of them. The one thing I'm more concerned about is the professions squish. This will make the old world items that we've been selling (TBC Dust still sells by 200 stacks easily) only required for Transmog and not leveling. This was a better option for a lot of professions (especially enchanting). Expecting their near-death with the next expansion. :(
Ya know. It's not the best source of gold, but it's all new gold: Run old raids and vendor all of the gear. In about an hour you can do Highmaul on LFR, Normal, Heroic, and Mythic and get about 6000g total. Some of the other raids aren't quite as fast, but generate similar amounts of gold. You can get some fun new (old?) transmog too if you haven't done much of it.
In Battle for Azeroth, the fall of the Burning Legion has set off a series of disastrous incidents that reignites the furious rivalry between the noble Alliance and the mighty Horde. As a new age of warfare begins, Azeroth’s heroes must set out on a harrowing journey in search of new allies, race to claim the world’s mightiest resources to turn the tides of war, and fight on several fronts to determine which side will lead Azeroth into its uncertain future.
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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.)
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.
I'm pretty excited about where the various gathering professions could go this expansion. Crafting expansions actually have good stuff to craft to prepare for the upcoming raid so gathering items will be needed. On top of that nodes are giving out less so more effort equals higher prices. Now where this goes past launch I'm not sure but stuff like Mining and Herbalism should be solid at the beginning.
In a few months only mats will be worth anything. At this point we have people with tens of millions of gold and people with just a few thousands. A flask takes tons of mats to make, and they will sell for well over 10k gold each, so the casual players won't afford them. When people realize that the rich guys will always take buying from the AH over farming their own mats, the prices will go even higher, then casuals will notice how expensive flasks are, and they will pick up alchemy and make more flasks, driving the prices down again.