When I was new to Postfix (that was at a time when the postgresql patch
was a brand new thing) I found the online documentation very helpful. And
it still is.
Don't bother too much with the comments in the config files (they are only
comments after all, usually only focusing on a very specifiy aspect). They
are helpful if you have allready some routine in running Postfix.
Have a look at http://www.postfix.org/documentation.html and dig through
the problem you want to solve there. I bet most of what you want to
configure is described there with the big picture and an overview of all
the corner cases it touches.
Postfix uses more then one file and several databases. That IS different
from a single config file to catch all.
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