Find a market on your server that is profitable and farm it, use your gold to then strengthen your income by investing it back into leveling professions, and when you get to the point, buy out and control those markets.
I'll share my results of two different but intertwined routes I've found successful on
my realm.
Firelands profile: https://store.buddyauth.com/Product?productId=3431
Embersilk bags/Potion of treasure finding. One acc, two toons, 3-6 hours of botting a day, one farming firelands w/ potion of treasure finding for greens to disenchant into hypnotic dust (which on it its own sells like ***** on my realm 4k+ a stack), then using the embersilk from the tiny treasure chests made into embersilk bags which sell for 200-300g+ and almost within a few hours of being posted.
Gold Summary(1 and a half hazy months of sometimes 3-7 days off of botting):
(picture excludes potion of treasure finding sells)
The second toon is farming the herbs for the potion of treasure finding 2-6 hours every other day, sometimes a few days off, which if I farm the herbs for a day I'll get enough potions for a few firelands runs and enough to sell on the AH for 200-300g each.
Then there is still bank to be made off the other mats from the tiny treasure chests (volatile water/life/fire/earth-pyrite ore/elementium ore) and if you have a rogue, the elementium lockboxes are also nice.