Every new expansion brings with it two things: more ways to make gold, and more ways to spend it. Making gold can be a very rewarding and engaging way to play the game on its own, but it's not for everyone. Here are a few tips that can help anyone make gold in the first few weeks of an expansion.
A huge part of how much gold you have is actually how much you spend. Most people neglect this part of the equation, allowing their subconscious to choose when to splurge. A very simple way to have more money to spend on even more cool stuff is to avoid buying something until you absolutely need it.
For example, if you decide to powerlevel that engineer or leatherworker, you have a choice: either pay now, or choose to wait a few weeks and level your profession when the mats go down in price. The only difference is the order you do things in, but waiting will save you thousands of gold in materials.