Tradeskillmaster is the best gold making addon for World of Warcraft. It does so much more than your normal auctioning addon. It has a lot of modules and I’ll provide links to all the ones I use.
Tradeskillmaster <– Required for all modules
Some videos I watched from Phat Lewts when I first set up TSM2:
Controversially there’s an out of game program that downloads the AH info from Blizzard’s servers. I use it so I don’t have to scan the AH, but some anti-virus programs pick it up as a “potential” virus. I still use it and the authors give the reason why it’s labeled as such on their website.
How to set up the TSM App by Phat Lewts: