Did you just start playing WoW or do you have a brand new character and want to learn how to make gold very quickly? Choose the one that is not busy for your log-in/log-out place. This mule you will post your stacks to for sale at the Auction House.Check the Auction House prices using the search facility and take note of the starting and buyout prices for the stacks of resources you are selling.  Dont waste your linen on bandages (FirstAid) .. at least not yet.Always set auctions for 24 hours and put a buyout price about 4-6x the value to an NPC vendor (again check the Auction House current prices so you Dont over or under value your items) ... the buyout price allows impatient bidders a way of getting their items quickly - and your money faster.Mail your major items to your mule for Auction House Placement, dump the rest of the garbage ontot he NPC vendor.

Don't waste bag storage space on grey usable items, ruined pelts, broken teeth etc. unless you are filling up an inventory for the run home. Keep green items for Auction House sale if your toon (or an alt) doesnt need them. Each stack will sell at Auction House for 5-10s per stack easily and up to 20s per stack if the demand is right, low level "green" items 5-10s each. My first (and still main) toon never got anywhere near this cash return so early (mage, miner engineer) ... my current level 10 gatherer is getting 1g per 2 hours of game time (mixing it up with questing and general fun) .... a concentrated effort should nett close to 1g per hour - a huge return for a low level character . Dont choose your crafting profession too early ... you can always drop one of your gathering professions for a crafting profession once your cash flow is good.Many items have a buy-out price upto 10-20 times the price an NPC vendor will buy from you. I personally set my prices as follows .... starting price 2x the NPC vendor buy value (around 1.5-2.5s per stack) and a buyout price 5-6 times the NPC buy value unless all the competitor sellers buyout prices are way above or below that, then I set my buyouts at just below theirs. A couple of hours work at toon level 6-8 will give you 3-4 stacks of light leather, 2-3 stacks of herbs, 1-2 stacks or metals bars (yep, smelt them for mining experience before selling them ... if you are "grey" on smelting copper (ie no mining XP form it), sell the stacks of raw ore) and if you are working in an area of humanoids 1-2 stacks of linen cloth.