In wow, what are some tips to making serious amounts of gold on the auction house?

It’s actually not tricky at all. Just get the Auctioneer Add-on for WoW. Use that a lot. You can farm a lot of wool, cloth, etc and sell that for a decent amount. Esp if you can turn it into bolts. You can make a lot with Enchanting ingredients (like stuff you get when you disenchant items). Also mining is a great way to make money. You can sell the ores/bars that you get after you mine and smelt.