ow I Made More Than 14,000g in World of Warcraft

This process involves trading
the auction house, i.e. buying cheap items and reselling them more expensively.
You need to have the Auctioneer addon installed.
The basic process is simple:
1. Go to the auction house
2. Press the scan button. Let the scan finish.
3. Go to the search tab
4. With the default settings, click search.
5. Place bids on the items that you think you can sell for more.
6. Change to Buyouts from the drop down menu. Press search again with the default settings.
7. Buy out the items you think you can sell for more.
8. Go to the mailbox and pick up the auctions you won
9. Go back to the auction house and put them up for sale at appropriate prices.
10. Profit
There's more to it than that of course. Some people prefer different setting and such. But the default ones will get you started.
As you understand if you've tried this, the hard steps are #5 & 7 and, to an extent, #9 (although if you've purchased items at bargain prices you'll not have a problem with #9).
An important thing to look at is the vendor sell price in the auctioneer tooltip when mousing over an item. A 24 hour auction will cost 60% of the vendor sell price in deposit. A 1 gold sell price to a vendor means 60 silver deposit at the AH.
Especially when starting out, try to focus on things that can make you a lot of gold, but have a low vendor sell price (and thus deposit).
Some things that come to mind:

• Enchanting materials (no deposit)
• Food (I have made a lot on talbuk steak, spicy crawdad, golden fishsticks etc.)
• Low level ore and bars like silver bars, gold bars, and such.
• Twink items. Made tons of gold buying twink items for 10 gold and selling for 25. Low deposit allows you to re-list it many times.
• Low level green gear, weapons and schematics and such. I make a lot of deals where I buy stuff for 10-50s and sell it for 1-3 gold.
• The new darkmoon faire cards if you are more advanced.
• Big stacks of stuff that I split up. I recently purchased 20 primal shadow for 280g and now selling them off for around 400g.