The guide is right here:
http://www.animemusicvideos.org/guides/avtech/
IT covers alot and is not exactly straight foreward. If you've never dealt with video on a computer before it may be daunting or confusing. Just go through it slowly.
TVs & Video cassetes are "analog" devices. They receive/send an analog signal. DVDs use digital encoding, then converts it to analog for a TV. Computers are digital. If you have a DVD-Rom you can digitally copy the DVD to your computer with no loss in quality. You can infact, give it better quality on occasian, once it's on your computer. Doing this is alot better than trying to capture through a capture card. Since the capture card is taking analog input and converting it to digital.
You'd go :
Digital DVD > Analog output over cable into capture card -->Digital file on computer.
That's a waste. Also Macrovision prevents this most of the time by giving you a flickering picture that looks crappy.
Read the guides and use DVDs, digitally :p