Gold Making is all about having a goal. If you are not motivated to do a proper job then you are a lost cause. There is no method where you can get thousands of gold for doing nothing. Face the truth, everyone, no matter how much gold they have and how little they claimed to work for it spend hours doing the right things and as soon as you realize nothing in this world is free and you got to work. You will see an increase in gold, and before you know it, you are gold capped.
Auction House is the #1 way to make gold. Doing dailies is a complete fail unless you want achievements. Farming rare pets, using professions, buying cheap items and selling them for more is just a small part of the AH trade. But to make sure you make the right decisions you need addons to help you finding the right items, putting them for sale faster and keeping track of what price is “Normal” so you can easier find the cheap ones.
The addon I use is Auctionator. You can download the addon here: http://wow.curse.com/downloads/wow-addons/details/auctionator.aspx
The addon is simple and will do most of the work for you. There is a nice “Buy” tab when you open the Auction House. Click on it and search for Cardinal Ruby.
If you want to sell items you simply Press Alt+Left Button Mouseclick on any item in your inventory and it will automatically place the item in the “Sell” window. The price is also set so the only thing left for you to do is to press “Create Auction”
*The duration is set to 12 hours. I always make it 24.
48 hours are bullshit and someone will undercut you if you do not sell it within 24 hours, so you pay for 24 hours more then needed.