Before I start off: This is not a guide to buy an item and sell for higher profit! We all know this!
Now. You are going to need an add-on called Auctioneer. This can be downloaded from this website: Auctioneer - Addons - Curse
I am going to assume you know how to install an add-on.
After you have installed it, log into your WoW account, and go to the nearest Auction House. Begin to scan the Auction House:
After a while. Your scan will finish up. Go to the Search button in Auctioneer, and press the button Searchers> vendor.
( As shown on this picture )
You will now see a window where you can change the settings to what you want. But I suggest these settings:
Once you are done. press the '' - '' button as shown on this picture. And scan the Auction house once more.
Once you are done. Bid on all the items! You can sell them to a vendor once you win the bid. Because people rarely bid on green items. And people are stupid enough to post them as bid lower than the vendor price. So you will make alot of gold! Let's say you use 2000 gold to buy items. And you bid 2g on each. And sell for 3g, that's 1000 gold just from there. And most of the time, items will resell for 4-5g profit! Talk about easy money!
And that wraps up my guide for today. And if you got any addition to the guide. Then throw me a tinker! And I will add it.