Please, if you don't mind, read everything before scrolling down.
This is just a lineup of DC movies that's centered around bringing in Justice League movies. (There can be other Superman and Batman films during this time.)
We've had plenty of Batman movies and now finally getting a Superman movie that will give us some action, and also a Green Lantern film that was not as good as it should have been. With Marvel doing their whole Avengers assembling by providing individual movies for each character and bringing them together, this has shown that, IF DONE RIGHT, this can also be possible for DC to do with a Justice League movie. DC has too many good heroes and story lines that would be great for the big screen not to use.
Here are movies we need to see on the big screen in the order I think it should go. I will be working on specific story plots for each movie over the next few weeks, and also provide casting for each movie too, but for now I'll just provide a quick indication of what HEROES to expect in each movie. I'll provide villains and plots for each movie individually later.
SUPERMAN/BATMAN: June 2014
(Superman and Batman. Ends with them seeing how good they can work together and how much they can accomplish, so they decide to start recruiting other heroes to form a league of heroes to help each other when needed. I think Supes and Bats should be the ones to start it since they are the two main leaders of the league. They find a place to set up a temporary league location and show's them finding their first recruit.)

(Each of these movies will show the room getting fuller and fuller as each movie progresses. Also, who invites who can change as I create story lines.)
WONDER WOMAN: July 2014
(Origin, ends with Batman telling Diana their plans and asks if she would like to join as well. Diana finds it fascinating that an ordinary human without super powers could do such great things. They gather with Superman and start looking for their next recruit.)
THE FLASH: May 2015
(Origin with Barry Allen, ends with Superman telling Barry their idea and asks if he would like to join and the last scene shows Flash joining Supes, Wonder Woman and Batman at the temporary league location and beginning their search for their next member.)
GREEN LANTERN SEQUEL: June 2015
(With Sinestro Corp (Done well..) and ends with Hal receiving a letter to meet the rest of the group of heroes at their location. Hal goes and meets with them and is recruited to the league.)
JUSTICE LEAGUE of AMERICA: May 2016
(Characters: Superman, Batman, Wonder Woman, Flash, Green Lantern, and Martian Manhunter. How MM came to be apart of the JLA can be explained in quick flashback's during the first part of the movie, and if MM is well received and liked, they can do an individual movie for him after. I think having these 6 heroes is enough for the first movie, don't want it to be too crammed and the league can expand as sequels come along. Bruce will be able to move money around and be able to set up a secret headquarters for the league on Earth during this first movie.)
AQUAMAN: May 2017
(Aquaman origin, ends with Martian Manhunter talking with Aquaman and asking if he would join the JLA.)
GREEN ARROW: June 2017
(Green Arrow origin. Batman discovers Green Arrow is actually Oliver Queen, who has billions of dollars and with that resource and his talents he would be a valuable member of the league and invites him to join. Bruce can't keep funding the league's facilities on his own.)
JUSTICE LEAGUE SEQUEL: May 2018
(Same heroes as before and also bring in Aquaman and Green Arrow. With the league being well received by the public and with Oliver Queen now in the picture, he and Bruce are able to afford to create a headquarters in space for the league.)
Again, I'll create story lines, villains and casts together for each movie in the next few weeks when I can find time. Thanks for reading.