ISO 9002 is obsolete since 2000. Actually, ISO 9001:2000 is now also obsolete. You need a copy of ISO 9001:2008, published last november.
Just fyi
BS = British Standard. In the case of ISO standards the text is the exact same as any other version printed in any country, but with British Standard printed in the title.
EN = European standard - ditto to above but European
For guidance on ISO 9001 you can look here:
http://en.wikipedia.org/wiki/ISO_9001
http://www.iso.org/iso/home.htm
this one is quite good, breaks the standard into the sections:
http://www.praxiom.com/iso-9001.htm
Note that the first thing you need to do to understand the standard is have a copy - the text can be specific - so there's nothing for it but to buy a copy. You might be able to get it cheaper than the BSI on sites from other accrediting bodies - Lloyd's, TUV, NSAI, DNV etc