(THIS GUIDE IS FOR HORDE SIDE ONLY HOWEVER THE SAME PRINCIPLE AND DIFFERENT FARMING SPOTS SHOULD WORK FOR ALLIANCE)
Ok I have been on mmowned for a day however I thought I would share a little trick I use.
This is how I make about 30gold or more by level 13 and all it takes is a bit of grinding.
I would recommend taking mining and skinning on your new alt.
I would also recommend rolling an orc/troll
What you will be farming:
You will mainly be farming boars for Chunk Of Boar Meat : Chunk of Boar Meat - Items - World of Warcraft
Which is a low level cooking matt. These sell in stacks of 10 on the AH from anywhere between 1gbid to -2.5g buyout. However this all depends on your server.
You will also be farming copper ore which you will then smelt and then sell on the AH for 2.5g -4g buyout once again this all depends on your server.
You should also get plenty of Light Leather which depending on your server you can sell for 1g-1g50
Ok now quest and start skilling up your profs while leveling when you hit about level 7 head to orgrimmar killing all the boars you see on the way and skinning them also loot any mines/herbs you see. Once you get to orgi make it your home (using your hearthstone)and put anything on the AH that you have a full stack off .
Now head outside orgrimmar and turn left and start killing: Elder Mottled Boar
While patrolling the area skin the mobs and loot the mines.
http://www.imagehosting.com/out.php/i1407472_farmarea.JPG
Now I usually patrol within this area as there are upwards on 5copper mines that spawn regularly aswell as plenty of boars to skin and loot boar meat from. In between respawns you can move to another spot or farm the other mobs in the area.
Now all you have to do is farm and auction all the stuff worth anything. Rinse and Repeat.
Its worth having a few bags as the more bags you have the less trips you make to orgi.
Hope this works out for some people.