Here is a quick break down on the ways to make money in the game and the pro's and cons as I see it.
1. Farm. This means get signet and kill only easys.
Pros, anyone can do it starting from level 1. If you target right creatures, you can up the odds you will get better crystals (fungars, bats, V.S. Worms and Rabbits).
Cons, boring. Nowhere near 10K/hr.
1a. herding
Get a mage job up to the level where you get AoE (-ga) spells. Round up a bunch of really weak creatures and drop a bomb on them.
Pros, You amaze the n00bzors with your l33t Aoe killing.
Cons, The second heard never seems to have as much ph4t l00tz. Can be dangerous.
2. Quests
Pros, you can get items and money fast and two early quests will get you scrolls that sell for a lot.
Cons, you may need to level up or get a freind to help you get the RARE EX drops needed. The really good quests are one shot so while you could do 10K/hr ONCE then it's over. And it's in about the 3rd hour. ;)
3. Crafting
Pros, Make Money Fast!
Cons, You need to invest a TON of money and time first. The investment will pay off, if crafting doesn't bore you to tears. You are also at the mercy of the AH for both buying and selling. Hint, people use up food/bait and need more later.
4. Fishing
Pros, make steady money.
Cons, boring. Takes a fair amount of time and money to get to a skill level where it pays off. (Quickie guide, you level up fastest with the cheapest rods and bait. Cheapy rods break a lot, so buy a bunch.) Boring. Takes a lot of inventory. You need to learn which rods and bait work in which bodies of water.
5. Register more characters and play the Auction house.
Pros, You take advantage of human nature, which always pays.
Cons, Costs RL money and quite a bit of time as you comb the AH prices and make notes.
6. Level up another job.
If you save your gear and level up a job that can re-use your old gear, you can make OK money from drops. Leveling up RDM after WHM was a money maker for me since I already had half the spells and all the armor and equipment.
7. Sell a guide called "Make Gil fast!" at the AH.
Just kidding of course.
8. Get in an LS where the people like to give you money.
If you find one, get me in!
-Dystar