Fjerne gipshimling

I would like to remove downlights and then will end up with holes. Can you tell me how much it will cost to fix the holes? Or we can also take away the ceiling. The earlier owner of the house installed the gips ceiling and downlights, so there is an original ceiling hiding inside todays` ceiling. The problem is we don`t know the condition of the old ceiling and the lister, may need some work to fix as well. Two areas, one is 13m2 with 12 lights, one is 9 m2 with 5 lights. Would be nice to know which is the better solution and how much it will cost