I have given the task to install/implement the TLS certificate with zcs-Network-7.2.5 atop RHEL 6.3. I went through and practiced in my lab setup the following
Administration Console and CLI Certificate Tools - Zimbra :: Wiki
How to re-create self-signed certificate in a multiserver platform? - Zimbra :: Wiki
SSL certificates per domain - Zimbra :: Wiki

these resources(and others) are excellent but none of them discussed about TLS.. all of them are about SSL.

I have no previous knowledge of implementing TLS, therefore I need help.. please share with me the guides to implement the TLS with Zimbra.