Stormheim is the zone you want to start it. For some reason Legion treasures are not worth any experience like they are in WoD...except in Stormheim. I haven't been able to find out any reason for this, and it's possible it may get fixed/nerfed at a later date. But for the time being you REALLY want to jump from treasure to treasure to augment your quest experience.
The trend then reversed, and the price fell all the way back to 60,000 gold on Wednesday before recovering to around 80,000 Wednesday night. Over the weekend, prices have been fluctuating between 80,000 and 100,000 gold. When prices climb too high, people start paying cash to buy tokens and get gold, but the people with the gold stop buying tokens.
Another problem is that gold isn’t a finite resource; the game is constantly creating more of it. Gold is created every time someone completes a quest, kills an enemy or sells trash to a vendor. Some gold is siphoned back out of the game economy by repair bills, flight paths and a “tax” on auction house sales. Occasionally, a lot of gold is destroyed when someone buys a pricey vanity mount from a vendor. But gold is created quicker than it is destroyed, and it becomes less valuable as it becomes less scarce.
If you bought Legion and have no desire to go through old content, good news! The new expansion comes with a free boost to level 100 for one character. You can buy these boosts from the in-game store whenever you want, but they normally cost $60, so savor this free one. Use it for a class that you are confident you will enjoy. As a fresh level 100 character, you will be able to immediately begin the quest that takes you the Broken Isles, the new region where Legion takes place.
Some players like to try to game the auction house to make gold by buying things for low prices and crafting them into more valuable things, or simply reselling them at higher prices. You can also use large amounts of gold to buy special luxury items like very expensive vendor mounts that carry portable auction houses and repair vendors. Sometimes you can find special mounts that were exclusive to the Warcraft collectible trading card game that was discontinued in 2013, though many of the most desirable ones, like the Spectral Tiger and the Giant Rooster, are very rarely sold on most servers, and go for the maximum price of 10 million gold.
Edit 20 It’s been a week since this post and a lot of people are still reaching out to me with questions which is fine. I have had a few different people reach out to me to help make YouTube videos based off this guide and more info in BFA which I’m more than willing to do. Whoever gets the videos up first I will link them here for you guys to enjoy.