There are quite a few guides available linked from the main page:
http://www.animemusicvideos.org/guides/
The big one is
AbsoluteDestiny & ErMaC's Technical Guides to All Things Audio and Video mk2 or EADFAG. It does delve into technical details so it might be a bit overwhelming at first. A newer beta version can be found here:
Version 3 BETA.
There are some programs you will need. Primarily, DVD Decrypter, DGMPGDec (DGIndex/DGDecode), VirtualDubMod, and AviSynth, plus some codecs. I'd recommend downloading the
AMVapp version 3 beta instead of version 2.1 since the latter includes ffdshow which has caused issues with some computer setups (at least the way ffdshow is setup in that install).
You could start reading EADFAG v3 from here (
http://www.animemusicvideos.org/guides/avtechbeta/videogetb1.html) and skip some useful information (DVD ripping is described in step 2, click on the link).