Of course it's not a waste of time to play WoW for 2 months. The question is whether or not you have the will-power to stop after that!

Err I suggest you don't buy ANYTHING first. Download the game online or borrow a friend's cd, and register for the trial (there seems to be a prob with Blizzard blocking Msian IP registrations recently, even with anonymous proxy, so you'll need a friend overseas to do it). The trial lasts 10 days, and if you like it then buy WoW (without the expansion). The CD comes with 30 days of play for RM75+. You don't need the expansion yet, although it's admittedly nice to have even at low lvls, if $$$ is no issue.