Making WoW Money Strategies

If you don't want to read this entire article, but you're primarily focused on how to get your mount at level 30, follow these steps. They will work for anyone, require no grinding sessions, and generally offer a high reward-to-time ratio:

If you do nothing else, do this: Learn to use the Auction House, both for buying and selling.
Install the Auctioneer addon and use it to your advantage in the Auction House.
Bargain hunt, do not pay full price.
Always post a buyout price on your auctions - many players will not bid on an auction with no buyout, unless the item is heavily discounted, and then it usually sells for a fraction of what it could have gotten. You will have more sales at a higher price and get your money more quickly if you post a proper buyout price.
When you have saved around 5 (and you will quickly, due to having taken gathering professions), you can start investing. Buy cheap items on the AH and then re-list them for a profit. Only buy and sell what you know, and test your theories in small quantities.
Taking two of the gathering professions: Mining, Herbalism, or Skinning is a surefire moneymaker.
You don't have to Fish, and fishing is not to everyone's taste, it involves a lot of sitting and staring at a bobber, but fishing can become a good source of income as you level.
Crafting professions are money sinks if you pursue them.
The advice, "Do not take crafting professions until you are over level 40." is sound; at that level you can harvest many of the materials for yourself.
None of the crafting professions offers profit margins at low levels that exceeds the profit from selling the raw materials (ore, herbs, and skins).
Instead, in fact, often you lose value by crafting goods, the raw materials are worth more than the product.
If you do craft, learn what sells.
Generally, do not craft white items unless you know there is a demand for that item.
Learn what stats are useful and craft items that appropriately enhance those stats.
Do not overproduce; increased supply depresses price. You will get a better price per item if you sell fewer of an item.
Be frugal upgrading your gear.
Every bright, shiny new piece of gear is going to be old and shabby in a level or two.
Learn what stats help your character, and stick to that gear - avoid having to replace gear.
You do not need to upgrade at every opportunity, especially while leveling. Not even every nth opportunity.
Does the gear you are thinking of upgrading to offer a significant improvement? Think in per cent increase.
Plan on getting gear from quest rewards, drops, or instances.
Avoid investing a lot in high priced, well stat'ed gear, typically blue or purple gear.
Remember that you will be replacing it soon, no matter how good it looks now.
The demand for blues and better gear is high, so the price is supported. You will not be finding many bargains.
The players buying for Twinks have much better resources available, and can both afford to and are willing to spend a lot for the best gear. This drives the price up very fast and very far.
Participating in raid groups into instances can get you the same gear.
If you're a first-time player, learn first. Research. Ask. Test. Try, wisely.

If you follow this basic advice you should have no problem at paying for the mount at level 30, and you will always be able to afford skill training, food and potions along the way.