Recently, a number of IT departments have either installed Enterprise Manager, or have wanted to do so in the near future. For success in Enterprise Manager Implementations, especially when feature-rich packs such as the WLS Management Pack and the SOA Suite Management Pack are involved, I would recommend the following as general guidelines for the Enterprise Manager Implementation project:
Of course, the above is my opinion only, based on my experience in the product.
You can also read the Operational Considerations and Troubleshooting Oracle Enterprise Manager 12c white paper which is available on the Enterprise Manager Maximum Availability Architecture (MAA) site. This white paper has pertinent sections on staffing recommendations and administrator responsibilities that can be used as guidelines.
Good Luck with your own implementation.Regards,Porus Homi Havewala.(Oracle Certified Master)