Hi,
Please review the public beta documentation for the most detailed information. You can review the prerequisites, which one is it is not supported to install OCS on a DC.
Once you have OCSinstalled, you will need to configure Live Meeting policy and install the Live Meeting client and the Outlook Add-in (both included in the public beta download). When it is all enabled and installed it will be incorporated in the MOC client.
Please see the FAQs on where to get the documentation and Live Meeting client.