This document describes in detail the Steps for Installing Enterprise Manager Cloud Control in graphical mode. You can also refer to Enterprise Manager 12c Basic Installation Guide on OTN from the following link:
Oracle Enterprise Manager Cloud Control Basic Installation Guide 12c Release 1 (12.1.0.1)
For installing Enterprise Manager 12c Agents, refer to
Document 1360183.1
This document does NOT cover the procedure for Upgrading your existing Enterprise Manager system. To upgrade your system to Enterprise Manager 12c, refer to the following EM 12c Upgrade My Oracle Support notes and OTN documentation:
Oracle Enterprise Manager Cloud Control Upgrade Guide 12c Release 1 (12.1.0.1)