As a reference,
I start from
http://meeting.contextgarden.net/2008/talks/2008-08-24-taco-typescripts/liberation.tex
Also
http://context.aanhet.net/svn/contextman/context-reference/en/co-fonts.pdf
and
http://context.aanhet.net/svn/contextman/context-reference/en/co-typography.pdf
and look into base/*
(yes egrep is you friend)
For what it's worth, I have been using the command "texexec" to
process my tex files, am using a context minimals downloaded about two
months ago, and am running Linux.