Don't go spending a fortune on specific cables. To be a firewire cable it has to perform to the ieee1394 standards, which is all that is required for capture from a digital camcorder.
You can get a firewire PCI card that includes a cable from
Here for £7.99
Depending on the version of Windows you have you may well already have a great capture & editing package that is part of the Windows XP install called Movie Maker 2. Full help on getting the best out of this can be found at
www.papajohn.org
If you want to create DVD's then you will need to get some DVD authoring software such as the latest version of Nero or Ulead DV Movie Factory 3 that will let you create a menu & chapters and burn the disc.
Mark.