wow gold-starting

We sell WOW Gold .About one year ago,a friend told me that to sell WOW Gold can earn much money.I didn't know much about WOW Gold .I started this business without any help.Everythings should be treated by myself.It's a hard time.I don't play world of warcraft.So I also didn't world of warcraft gold.I should know where to buy wow gold for me.And how can I get cheap wow gold.If wow gold cheap, it will be a good price to sell to my customers.