You will need the subversion package (install with aptitude install subversion).
/etc/monit directory./etc/monit and issue:svn co http://svn.grimore.org/configuration-templates/monit/debian/templates
this will have the effect of creating a templates folder that you can update with svn update when there are template updates.
monitrc file in the same directory:svn export http://svn.grimore.org/configuration-templates/monit/debian/monitrc --force .
and adjust as necessary.
/etc/monit/monitrc file to 0700:chmod 0700 /etc/monit/monitrc
/etc/monit/templates/ into /etc/monit/conf.d/ depending on what services you want running. For instance, to monitor Apache, you would issue:ln -sf /etc/monit/templates/apache /etc/monit/conf.d/