Making an external HDD.

So I have two old Powerbook PATA HDD, one from a G3(80GB) and the other from a G4(100GB). I was hoping to turn one into an external HDD, however I could use some help. I would like it to connect it to my iBook via firewire, 400. So I need to find a case with that capability. If you have any thoughts on setting up the HDD so it works, such as more of the software end I would appreciate it. I also don't know how to make sure that the HDD is in master mode. Any input on this is appreciate. Thank You.