Solo Flash movie in December 2014 (if a script is already finished) - Charlie Hunnam for the role.
Solo WW movie in March 2015 - Gemma Arterton for role
MoS 2 in December 2015. Use this film to introduce Bruce Wayne. In the movie Bruce partners will Lex to rebuild Metropolis after the events of MoS. They are the two richest men on the planet, lets say worth about $100 billion apiece. This will lead directly into...
World's Finest in May 2016. Which will see Superman and Batman decide to start a team by the end. This will lead directly into the events of....
Justice League in December 2016 (since it won't have competition at the box office, this could pull an Avatar and be #1 at the box office for weeks/months). This movie will concentrate on the Big-5 of the Justice League. And because all the other characters have been introduced, JLA will just introduce GL John Stewart.
The plot should either revolve around, or involve in someway, the Guardians. There should be a threat so large that Superman, Batman, WW, and Flash can't meet it on their own and John Stewart gets introduced and helps the team against whatever threat it is. I'm not sure if Darkseid should be the villain so soon, he's really the big kahuna in the DC Universe in terms of villains and maybe should be saved for JLA 2, or 3.
Perhaps the threat should be Crime Syndicate, Intergang, or Vandal Savage.
Once JLA is finished release a bunch of "2nd Generation" (not Phase 2

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solo movies included sequels and introduce Aquaman and Martian Manhunter with their own films.
I think Aquaman movie should concentrate on the Atlantis/lost-civilization angel. Make it like an Indiana Jones/Uncharted type of adventure movie. Maybe change Arthur's backstory to be an archeologist searching for Atlantis. Something along those lines.
The MM solo movie should reveal that MM has been aiding league members for a few films now. Maybe he really does end up being General Swanwick. Or perhaps in Flash and WW solos we get a reoccurring character but they remain mysterious. The Nick Fury analogy is not quite accurate, but I think having a character that spans all these DCCU films would string them together well.