Beginner Guide to Dominate the Auction House in World of Warcraft

I rarely used any consumables; I never bought any upgrades in the Auction House. This was what I was like when I rolled my first toon more than three years ago.
Three years later, I still see many new players struggling to make much WoW gold. I want to share a few tips that will help you guys get started. I still remember vividly my first time entering Stormwind City on my level 10 human rogue. I remember entering the Auction House for the first time, drooling over a 90g dagger when I had 14 silvers in my pocket. I was one poor rogue, but I was thinking big things, the simple idea of buying low and selling high arose in my head.
There was one predicament though, I gambled on the items that I purchased. I never knew if a profit could be made from any of the items that I bought. Surprisingly, I was still making a profit.
I made a level 1 character; I ran her to the nearest Major city and just sat her in the Auction House. I would log-on to this alt 2-3 times a day to buy/sell in the Auction House. As time went by, my brain became more familiar with the items, I was remembering item prices and I was profiting a lot faster. When my main character turned level 40, my alt had turned 30 silvers into more than 100 gold.
The majority of my purchases were items with very low deposit fees. This reduces the overall gold lost if items don't sell through the first listing. Shards and Dusts were my ideal target because they are in high demand and they require NO deposit fees.
When the add-on Auctioneer came out, it saved me so much time. I did not have to sort through pages of Auctions; the add-on automatically scans the entire Auction House and provide you with recommended list of items.
I bought a lot of items that never ended up selling. One case that I still remember til this day was the purchase of Mass of McGowan (1 year pre-BC). I remember listing this item more than 10 times and it just wouldn't sale, I just gave up eventually because the deposit fee was killing me.
There are always risks involved when bidding in the Auction House, but in order to make the big profits, there will always be some risk.