Learn who sells what and memorize it. A Superior Healing Potion sells for 9 SP from a vendor and resells in the AH for 50 SP. The more remote the location of the vendor, the more this rule applies. Vendors often have rare items for sale that when bought disappear for a set time period. Many of these items sell for 5 to 10 times what you pay for them in the AH. You can tell these items because they will have a number on their icon. The beauty of these items is that their vendor resale price is always very low, which means they are also cheap to list in the AH. This means you can afford to list them several times until they sell and still make quite a bit off of them. Aim to get more and more wow gold.

Many food and drink vendors have rare potions for wow gold sale. Items sell best that boost the target stats. All classes can use stamina. Casters look to boost intelligence most of all. Fighters want to boost strength. Hunters and rogues agility. Paladins are fighters, but also want extra intelligence. Casting classes can also use some extra spirit, though many consider it worthless. Things that boost attacks, spell damage, crits, etc. are very well liked.

Trade skill recipes in particular resell very well in the AH. For example, you can buy the recipe for the superior mana potion in The Undercity for 1.2 GP and resell it in the AH for as much as 6 GP.  WoW trade skills are actually very profitable. If you are playing and have skipped this aspect of the game, you are missing out of a significant source of wow gold. You can choose to pick one of the creation/gathering combinations like herbalism/alchemy, or to do two gathering professions and sell what you get to the other players. You should go to learn more wow gold in the game. This can help you go to enjoy more fun.