Loot everything - Every single item in the game has some value and you should take advantage of this fact. Grey items can be vendored for that little bit of extra pocket money and white stackable items are needed for crafting, which means that people will generally buy them if you post them on AH for low enough price (if you can't be bothered to post Auctions, you can just vendor all of them and be done with it). Some of the looted items will rise in value over time, so you might also want to take your time and store them on Bank Alt.
Unlike in the current World of Warcraft: BfA, Gold wasn't that easy to come by back in the vanilla version. Earning Gold for your first mount at level 40 was an accomplishment for the majority of players. When the game goes live and you decide to start your adventure, you will notice that every piece of equipment, crafting material and such is extremely expensive. That's always a thing when a new server or game is launched, as demand far exceeds the supply. You will also notice that quests give significantly less Gold compared to now, which makes it a necessity to play efficiently, and know goods spots for farming Gold and leveling.
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Kurzen's Compound (marked BLUE on the map) - Colonel Kurzen was once a very talented Stormwind Officer. He was sent with an expedition to the Jungles of Stranglethorn, where he fell victim to Mai'Zoth, a powerful Ogre Mage and his foul magic. Majority of Colonel's troops are still loyal to him and provide Players with some valuable Loot. In this spot, you will encounter Kurzen Jungle Fighters, Kurzen Medicine Men, Kurzen Wranglers, and Kurzen Commandos. These Humanoids drop a lot of Silk Cloth (that can be generally turned into Bandages and Vendored), valuable Wool Cloth (the main source of Gold from this spot, check the AH prices), Fadeleaf (Medicine Men), Liferoot (Medicine Men), 12 Slot Bags (Commandos), Vendor Trash Items, and some Pocket Money. This spot is especially good for Rogues, as the ability to Pickpocket mobs will increase profits by a noticeable margin. Recommended Level - 34+ (36+ to be extra safe, as Humanoid mobs can be problematic because they tend to run away on low health and pull additional enemies).