Instructional Material: First Persion View (FPV) Operations
This AMA linked video describes How to Fly FPV.
The video describes outdoor operations, but the same principles apply to indoor FPV.
NOTE 1: For outdoor operations, FAA regulations require the pilot must maintain line-of-sight with the aircraft, so only sUAVs under the FAA weight limit may be flown outdoors in FPV mode.
NOTE 2:
> The Parrot Mambo requires a separate camera, controller and phone-compatible headset be purchased/installed for FPV operations.
> The Tello requires a controller and phone-compatible headset be purchased for FPV operations.
> The Spark requires an expensive custom DJI headset and cable be purchased and can only be used indoors (since it is over the FAA weight limit).