Its not possible to edit digital video via the 'S, cable. DV cameras have input/output i-link (IEEE1394)Firewire connectors for editing purposes.
Assuming your camera and computer has this facility and you are running Windows XP the operation is fairly straightforward, as WindowsXP has Movie Maker software builtin. In the absence of XP you will need editing software like Pinnacle or ULead which are now available with firewire cards which can be installed in a PCI slot in the PC.
It would help if you could provide full details of your PC specification and operating system.