Single Mode Fiber
Single Mode fiber is used when you are trying to go long distances, think miles. Single-mode is normally used by ISP providers.
Multi-Mode fiber is used when going from point A to point B usually in the same building. Think IT room to IDF closet in the warehouse.
LC or SC Connectors
The type of connector will depend on the transceivers you have. Check your switch specification to find a compatible fiber module.