Short answers, pulled from the story.
Napoleon Bonaparte became Emperor of the French on the 18th of May 1804 when the Senate granted him the title. He received his imperial crown inside Notre-Dame de Paris on the 2nd of December 1804.
Major battles included Austerlitz on the 2nd of December 1805, Jena and Auerstedt in 1806, Eylau and Friedland in 1807, Aspern, Leipzig, and Waterloo. The Battle of Austerlitz overshadowed the defeat at Trafalgar while the Battle of Waterloo ended the Hundred Days period.
Joseph Bonaparte replaced the Bourbons in Naples while Louis Bonaparte ruled the Kingdom of Holland. Joachim Murat became Grand-Duke of Berg and Jérôme Bonaparte was made King of Westphalia. Eugène de Beauharnais served as Viceroy of Italy and Stéphanie de Beauharnais married Karl of Baden.
The empire lasted from the 18th of May 1804 to the 6th of April 1814 before briefly returning from the 20th of March 1815 to the 7th of July 1815. Napoleon surrendered to the British after Waterloo and was exiled to Saint Helena where he remained until his death in 1821.
The Napoleonic Code increased legal equality across Europe and established jury systems while making divorce legal. Seigneurial dues and aristocratic privileges were abolished except in Poland and public education received a liberal restructuring.