You will need a capture card. This can be analogue or firewire.
Analogue usually comes with editing software.
Firewire should work with most editing software.
A cable to connect analoge or firewire.
If your camera is DV in enabled you will be able to send the edited video back to the camera. An alternative is to encode to mpeg and write direct to CD or DVD.
Further information will be available from the more knowledgeable on the forum.
Regards Brian j