Use your proffession. (Pick herbs, make stuff, enchant things etc.) This will give you skill points. About every ten points you will get a new recipe from your trainer or the suction house. At skill lvl 50, 125, 200, 275 and 325 (I believe it stops there) you will go up a grade (eg apprentice to journeyman)
Through the Mining and Skinning profession's.
You can get easy gold on WoW through the Mining and Skinning profession's.
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If you have the profession "Leather Working" you can use it to make items, item enchantments and other stuff.
Radar
The quickest way to get gold in WoW is through the Mining and Skinning profession's.
Herbalism can be combined with Alchemy to make potions, or Inscription to make glyphs and scrolls. If you are only interested in money you can have skinning or mining as your second profession and sell the proceeds.
A complimentary profession to skinning would be leatherworking. This way you can make armor from the skins that you collect with skinning. Of course you could choose to take another gathering profession and have a dual gatherer. This would be beneficial in that you gather resources for you other toons professions.
Without using external speakers
Radar
doctor or if you don't mind the lower salary a teacher.
You can make easy gold in WoW by the Mining and Skinning profession's. completing quests is the easiest way to get gold.