There is hundreds of ways to make money in this online game
This is another fantastic guide that I have found on the main WoW community forums. This one is basically a how-to guide on making tons of Hero gold. It will tell you what to do so you will always have enough money.
For that mount and anything else you may need gold for, but it does take some time to accomplish. If you are short on available play time or want to make the gold ASAP then here is a wow gold guide that I use quite a bit.
Again, this is how I made my money. I have been playing this game since the first week it came out and I have never made an altheas guide is truly the path I took from level 1-60 (with a few modifications here and there as lessons learned from my mistakes!)
There is hundreds of ways to make money in this game. You be a gatherer the entire time, selling mats and make money. You could do nothing but manipulate the Auction House and make money. You could grind areas that are known to drop rare and epics and make money.
There is tons of ways, this is just my way. Enjoy!