well you need new hubs, discs, calipers, the disc brake handbrake stuff and new cables probably. Generally it is easier to buy a whole rear axle off a disc braked car (if it is FWD which i imagine it is). You will also probably have to adjust the brake balance and if you are unlucky get a new master cylinder as it may need to be more powerful.
Easiest way would be to rip everything from the master cuclinder back to the rear axle out of a scrapped car...
...but....if you have ABS then i would forget it as you will probably need it all changing too!
ie just go buy a new car!