Oracle provides the template for VirtualBox OEM 12c Cloud Control 12.1.0.3 version. For practicing and learning OEM 12c Cloud Control, this is the quickest way to get Cloud Control up and running. Enjoy!
Access the setup document from Slideshare
http://www.slideshare.net/BijuThomas3/oem-12c-cloud-control-setup-virtual-box
Happy Holidays!