Welcome to the forums.
If this is a single server then make the changes recommended in the Quick Start Guide, install a DNS server (or have your DNS records set-up if they're hosted elsewhere), you can check it out in the 'DNS in a nutshell' thread. Once you've done that, install Zimbra on a supported platform and away you go, it's real easy. Don't use it for a 'live' system until you've used it for a while, see if you like it or if it does what you want. You won't need a tutorial, there's plenty of info in the forums.
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Regards
Bill
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