The ArcFM Resource Center has several resources that can help you, especially the Fiber Manager Data Model Overview: http://resources.arcfmsolution.com/10.2.1b/Appendix/webframe.html#OverviewFM.html.
The Fiber Manager Configuration Guide can also serve as a good starting point: ArcFM Desktop Configuration Guide
If you have other specific questions, you can post them in the GIS Support space, where there are more Fiber Manager users who can share their experience with you.
Thank you Laurel for the documents links.
I would like to learn form GPON operators FM way of working, could you please share your experience with me?
Especially the planning part and the mass ONU/CPE handling