So, you've decided to start playing wow, and need to make a little gold to get you started and pay for things. This is understandable, and not that hard to accomplish.
Here's how to do it:
1 - Start a Rogue.
2 - Level to 15 by questing, killing stuff, or pet battles. Choose the Nightstalker talent so you move faster in stealth.
3 - Level to 16. At this point, you learn Pick Pocket.
(You're probably wondering how you can make gold picking pockets)
3 - Go to Northern Barrens. If you are playing Horde, you're probably already there.
4 - Pick the pockets of Kor'Kron mobs (not the Earthshakers)
Normal mobs at level 16 drop ~1 Silver to ~3 Silver.
The level 90 Kor'Kron mobs you are pickpocketing will drop ~38 Silver to ~72 Silver and occasionaly drop greys that vendor for 1g25s(and they stack).