Short answers, pulled from the story.
Francis II of France became king on the 10th of July 1559 after his father Henry II died in a jousting accident. He was fifteen years old at the time and his coronation ceremony took place at Reims on the 21st of September 1559.
Francis Duke of Guise and Charles Cardinal of Lorraine controlled the government while Francis II remained young and inexperienced. These two brothers split custody of the kingdom with Francis leading the army and Charles managing finance justice and diplomacy.
Francis II of France ruled from the 10th of July 1559 until his death on the 5th of December 1560. His health deteriorated in November 1560 with fainting episodes occurring on the 16th of November before he passed away in Orléans Loiret.
Mary Queen of Scots returned to Scotland because Francis II of France died childless allowing his younger brother Charles then ten years old to succeed him. The marriage produced no children and may never have been consummated due to Francis's illnesses or undescended testicles.
Military conspirators who remained under arms faced execution with many hanged from battlements as warnings including Baron de Castlenau. An amnesty declared on the 17th of March allowed those laying down arms within 48 hours to go home free while the Edict of Romorantin shifted trial for heresy to ecclesiastical courts lacking ability to provide death sentences effectively abolishing capital punishment for religious crimes.