Tip 3 - Every trade skill in World of Warcraft has a complement.

Players can only learn two "professional" trade skills (Fishing, Cooking, First Aid and a few others don't count). Be aware that with the exception of Enchanting and Tailoring, every trade skill has a "gathering" skill and a "crafting" skill. Blacksmithing, for example, requires raw materials that can only be retrieved by Mining. Be sure you select the appropriate skill; otherwise you will end wow gold up buying raw materials at auction or trying to trade your raw materials for finished goods.
Tip 4 - The Num Lock key is your auto run.

This should be obvious, but you'd be surprised how many players forget to use their auto run. Auto run is your best friend, though. During long runs you can be checking your quest log, futzing with your inventory, or chatting with friends. Use it!