This is not a good machine to play WOW on. A moment's search of the internet would tell you this.
Mac® OS X 10.3.9:
* 933 MHz or higher G4, or G5, or Intel processor
* 512 MB RAM or higher; DDR RAM recommended
* ATI or NVIDIA® video hardware with 32 MB VRAM or more
* 6.0 GB available HD space
* 4x CD-Rom drive
* 56k or better Internet connection