First and foremost, Auctioneer is your best friend. You cannot run the AH successfully without it. I'm not gonna teach you how to use it, but I will give you a a few tips:
- Undercut the lowest seller by 1s 1c.
- The best days to sell fish are Tuesday, Wednesday and Thursday because those are the days most people raid. Weekends are not good.
- Cook the fish into Fish Feasts, split them into stacks of 5 and sell those. Other buff foods might work as well.