The rules in Ireland are that if you use the drone for business you must carry PL insurance that covers aerial photography (about £1200 a year) get certified by the aviation authority (£1k), obey no-fly zones around airports (5 mile radius), stay below 400 feet, and even if you've a video link you must have line of sight with the drone at all times.
If you're just doing it for fun then the insurance & training aren't mandatory.
I've had a couple of drones & I'm currently building a custom 3D printed FPV octocopter,.. even with the fancy auto stabilisation and GPS position holding they're not easy to operate & take a lot of practice. Highly recommended as a hobby - but not for work!
I've got a customer that offers this service in one of the businesses he owns.
I don't know the in's and out's and all of the legalities etc. but I do remember him telling me that he sent two of his staff on a training course related to the civil aviation authority (seriously!
) because they needed to obtain a license for the particular type of work they used the drone for.