So, the first thing I'm going to say is - Stop changing professions. It is costly in terms of both time and gold. You will invest a lot that you then need to make up to get back to breakeven.
Second, start simple. The vendor supply guides that @Sinshroud and @dbMjolnir pointed to are a great place to start. You run around a small area, buy up all the limited supply items and put them on the AH at extremely high percentage returns (a few silver to 50/100/more gold). Will this solve your gold woes by itself? Absolutely not. There is no silver bullet. The really good gold-makers in these forums do a lot of little things to make money. People talk most about the "thing" that is making them the most impressive amount of money at that moment. The problem with that is that it changes for them over time and it's different from one server to the next.
On the flip side of that, avoid the difficult for now. The Shuffle usually involves JC, Alchemy, Enchanting and Tailoring (and potentially other profs). It's a huge process that involves knowledge of many markets in order to be most effective. It's a lot of work as well.
Finally, use what you know to make money off other people. You've recently leveled a couple professions. What really sucked about leveling those profs? Did you often feel like you were getting squeezed by others that were taking advantage of you? I hope you see where I'm going here. There are two ways you can use this information. One, you could go out and farm some of those chokepoint materials to list at stupid prices. Two (and this is much more fun), you identify a chokepoint that currently has a handful of cheap mats on the AH. I'll make up an example (which may not be a good one on your server depending on prices). It's almost impossible to level Alchemy without using some Goldthorn. I'd check the AH. Suppose I see 10-20 Goldthorn at ~1g. Buy them, repost them at 3-5g each. There is actually a great post about leveling chokepoints that you could use as a guide for this exercise. I have to get back to work, however, so if someone else can find that, I've got a +rep waiting for you.