A quick search tells me this :)
First you have to register it with the FAA if 55 pounds or less which almost all outdoor drones are included in this.
Never fly over or around vehicles or people, 25 feet away minimum (i.e. if it falls from the sky you are liable for any damages, accidents, etc).
Keep it under 400 feet and also within your sight.
Not within 5 miles of an airport.
Not anywhere that privacy is expected.