Puppet users - Jan 2014 - Just starting and already a little confused

Greetings,  I installed open-source puppet-server on RHEL 6 and in 
/etc/puppet I see the puppet.conf.

I see entries like:

# The default value is '$confdir/ssl'.
    ssldir = $vardir/ssl

My questions is where do (or should) these variables get set and why is the 
default here $vardir and not $confdir? 

Also is there a page that shows how to create your initial 
/etc/puppet/manifest/site.pp file?
I did not get one during install 

Thanx

-j

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