I'd disagree with this. The easiest way to make that gold is by using traps to get pet eggs and selling them. You may not need that pet egg for yourself, but you definitely need to know how to capture them. You can make several hundred thousand gold in profits selling the Rune and Holy pet eggs on the AH. You can make several tens of thousands in profit selling the Amazing and Natural eggs. The traps are pricey for a low level, but once you get that first purple or orange rune pet egg and sell it, they get to look a lot cheaper.
I used to farm pet eggs. Once you sell first as Miladian said, you will not worry about price of traps, and you will learn to carry 10 or more all the time. There is only 1 fail element (Wind) that you either throw away or use on your own alts... they do not sell at all. All other sell, and some of them for quite high amount. Once you move to SL, that is where pet farming really starts to pay off. High level pets will drop all the time, and those should sell for 100-300K. Some n00bs might put 350K and higher price - but that really does not make much sense, as the same result can be then used with miller cake, and those eggs are in AH for very long time.200-300K for 8k investment is not bad. And if you get high aptitude (some 99 apt) or holy pet, now you can sell it for mil or more, depending on element and server.
It is never too early to start on your own pet, as long as you know what are you doing. First pet really does not matter, should be any element and should be ONLY working pet, used for crafting. Next pet has to be in your element, and should be Holy with as high apt as you can get, but still low level. How to make it into end game pet, rusty explained very well in his guide.