Well, while I'm working on getting a subscription to the full version of World of Warcraft, Ive been busy checking out the Free servers available. Basically as long as you pay for your game like normal, all you do is edit the text in your Realms list file and register a separate account with the free servers website. Your existing official blizzard account is not affecter in the slightest, as they are 2 totally different things. Which means you cant chat, message or transfer any items or stuff from the official game. Plus theres a few quirky little differences, like the monsters shitting tons of items, and you leveling to level 4 and 7 after killing 1 level 1 monster. So its best to look on the free servers as a kind of free beta.
Still, if you have issues with churning out your money for grinding online, you could do worse than head out over here: http://www.wowscape.net/

Oh, and I'm Devianti, a Blood Elf priest on the Funscape server.