Start with www.foa.org Fiberoptic Association. Some of the best material.
Next, contact the equipment vendors like VeEX and Viavi (Google Fiberoptic Test Equipment). Their websites are filled with tutorials.
Think about these areas of expertise that you will need to get into fiber
Theory - How does it work? Types of cables and uses for them.
Planning a fiber network - What do you want to connect and where
Building a fiber network - Running to offices or homes from centrally-distributed locations
Connectorization and Splicing - How to specify and also how to do it. Types of connectors.
QC, Maintenance, and Repair - How to verify an installation passes specs. How to locate and repair cuts and faults.
Good Luck!
Doug Marlowe