FAA Regulation

Use a “buddy box” system with two controllers. Use a radio system to instruct the non-rated pilot. The Remote PIC cannot supervise a non-rated pilot.

Visual observer. Person manipulating the controls. Remote Pilot in Command (Remote PIC). 

is operated by a Part 61 certified pilot. documents maintenance, preventive maintenance, alterations, and inspections.  is only operated over small groups of people.

must not cause injury equivalent to 25 foot-pounds of kinetic energy upon impact. be operated in accordance with the operating limitations specified in the approved Flight Manual. be 0.55 pounds or ...

Not to exceed 30 days. Within 10 days. Any time.

Every 8 months. Every 12 months. Every 24 months. 

It must not contain exposed rotating parts that can lacerate.  It must not contain exposed rotating parts that can lacerate and must not cause injury equivalent to 11 ft-lb of kinetic energy.

Yes, it will cost $5 per aircraft. They don’t need to, your aircraft are already registered and your pilots are certificated. No, they will have to obtain operating authority from the Department of Transportation.