This is a simple tip on how to make money at low level. Would be easier if you were an Orc or Troll because of their starting location. Orcs and Troll starts in durotar, for other races you will need to travel a bit further but it should all work pretty well.
You will need to become a Journeyman miner and purchase a mining pick to begin. Durotar has the highest number of copper veins so would be the most ideal place. Once you’ve collected a good amount of copper ore, return to the forge and smelt them.
Once your copper ore is turned in bars, follow the path from Razor Hill north to Ogrimmar and then head to the auction house. Talk to one of the auctioneers and set price to 40 silver for buyout and make the price 45-60 silver per 20 copper bars.
I’ve seen stacks of copper bars go for 4g but avg seems more around 80s-1g. Be sure to check the prices in the AH first before listing. This is an ideal way to make money at low level. Below is a map of Durotar.