1) what you need is a 'driver' for character input with your wacom tablet. in this case the driver required is double-byte for chinese input.
2) easily solved. challenger and some shops carry CDs of TrueType fonts.
3) driver alone about $30, with software bundling $150-$300.
4) i am using SinoPen InputEasy. it's a software driver to use the wacom pad for character input. if you're using winxp, you don't need software bundling as chinese input is already built into the OS. with this driver, i am able to input chinese character with almost all programs in the system. this limitation is some programs aren't built to cater for double-byte input.
hope this helps.