multi-rotors

Dear
if you can help me with the selection of equipment, I want to put together a multi-rotors that should handle the recording equipment and accessories weight to 4kg. I would like to make multi-rotors with six engines, although there is a possibility specifying via GPS or manually. Which engine to choose, Speed Controller,whether it be guiding arduino if there is the possibility of setting it down through GPS and after a while again soar.
Regards

Čunko Marina