Newbie Cyrus Configuration

[Norris Ward]

Hi all,
            I am new to cyrus imap but I can navigate my way around RedHat
7.3 fairly well.  I want to reconfigure my email server away from imap-2001.
Where does cyrus-imap store it’s config files?  Also from my readings of the
cyrus info, I would like to clarify this: can  cyrus read the pam_db of my
system to authenticate users that already exist?  Also can cyrus be
configured to store users’ mail files in their ~home dirs?

Thanks for all your help in advance