The first film to be released would be Last Son of Krypton II, the origin tale of Kal-El becoming Superman. To better understand things, read below and comment.
Days of Krypton
The tale of Jor-El and Zod rising through the ranks of their repective duties as a Scientist and Miltary officer, the truth behind their fued as Zod believes that Jor-El took Lara away from him and he begins to plan against the Ruling Council.
Last Son of Krypton I
Zod begins to make moves in his plan to takeover Krypton gathering forces and secretly taking over Black Zero. Jor-El and Lara meanwhile have their first child, Kal-El whom Jor-El plans to save above all if Krypton falls.
Last Son of Krypton II
Growing up as Clark Kent, a Kryptonian crystal hidden in the barn reveals the truth to Clark that he is infact Kal-El of Krypton. After honing his powers and travelling to further understand humans, Kal-El becomes Superman, earth's protector.
Superman: Man of Steel
A battered Brainiac arrives on earth still seeking the Kryptonian crystal and to build a new body and ship. When he discovers Kal-El, known as Superman he uses the body of Dr. Milton Fine to force Lex Luthor to comply with his plans and take the knowledge the crystal posseses.
Superman: Revenge of Zod
After opening the Phantom Zone, Brainiac released Zod from his inprisonment who hadn't aged a day. After realising Krypton was destroyed and he is infact on earth, Zod plans his revenge against Kal-El whilst planning to release his inprisoned army to create Earth into New Krypton.
Fallen Hero
Whilst out on assignment to the soldiers in Afghanistan as Clark Kent with Lois, LexCorp uncover a spaceship thought to be left by Darkseid. When Doomsday is is released on Metropolis, the Justice League confront it but are no match for the monster. When Superman arrives, the mighty titans kill each oher. When the world mourns, Brainiac reboots ready to finally take the knowledge from the Fortress of Solitude.
Note that the Krypton movies are not titled "Superman: " because in those movies he is not Superman until after Last Son of Krypton II. Fallen Hero is a Justice League crossover so it would be unfair to title that movie Superman. To see how this fits in with the rest of my universe, see below.
Universe timeline of movies.
Days of Krypton - 1800/1830
Last Son of Krypton I - 1830/1860
Batman Begins - 2008
The Dark Knight - 2009
Last Son of Krypton II - 2010
Green Lantern - 2010
Flash - 2011
Batman 3 - 2011
Superman: Man of Steel - 2012
Superman: Revenge of Zod - 2012
Green Lantern 2 - 2012
Justice League - 2013
Fallen Hero - 2014
Note that the dates in the timeline are when the movies take place and not Release Dates!
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