How much Weight can a drywall ceiling hold
It is recommended to not hang anything just from the ceiling drywall by itself. Particularly anything you have concern that it could fall due to its weight or safety of people or things under the hanging object. 

Instead you need to locate the structure that holds the drywall in place and screw the hooks / brackets / retainers into that structure. The type of things you screw in would be dependent upon whether the ceiling structure was wood, metal rails or concrete. But since we have no guidance from you yet as to what type of structure you have suggestions are limited.