First priority: stop the water
Roof repair and drying are essential. Cleanup alone will not solve a problem if rainwater continues entering the building.
Check beyond the stain
Insulation and concealed materials may stay damp after the visible ceiling surface appears dry.
Trusted guidance: This site uses U.S. EPA mold and moisture guidance and Florida DBPR mold-related-services rules as reference points. If you have health concerns, consult a qualified health professional.