Read up on the game on the various forums from all the different sites.
Check out the main site: www.worldofwarcraft.com
Read up on this site, on Warcry's site, on IGN's site on all the others.
Come up with questions and ask them (prefarably ones not asked before
![Smiley: grin](//zam.zamimg.com/i/smilies/grin.gif)
).
Then once you've done your research, decide then.
Of course people here will say to buy the game. It's up to you to decide if it's the game for you.