Ok so this is sort of a crazy continuity line that I will attempt to piece from the info given about this New 52 Universe.
-At age 3, Bruce is in a car accident that causes his mother to premature give birth to Thomas Wayne Jr. (whom died that night).
-Bruce’s parents are killed in front of him as a child (between 7 or 8).
-A couple of weeks later he goes to try and find the Court of Owls, he is locked in one of the presumed “nests” for a week.
-Sometime during his adolescence, Bruce travels the world in order to become a vigilante.
-(A year or so before JL #1) Bruce becomes Batman and starts his war against crime, although he is mostly a myth within Gotham and the world.
-(JL #1-#6…5 years before Batman #1) Bruce encounters a Parademon which leads him to have an altercation with Gotham police. This brings Green Lantern into contact with him and later the formation of the League as they fight Darkseid.
-(Couple months after JL #6) Bruce meets Ra’s al Ghul and Talia. Damian is conceived…and possibly born a couple months later due to being gestated in a lab.
-(A year or less after JL#6) Bruce must have meet a 15 or 16 year old Dick Grayson, taking him under how wing after Tony Zuko killed Grayson’s parents.
-(That same year) Barbara becomes Batgirl.
-(A year or so later) Dick becomes Nightwing
-(Couple months later) Bruce picks up Jason from the streets and becomes the new Robin
-(That same year) Killing Joke happens, Barbara is left paraplegic and becomes (?) Oracle.
-(A year later) Jason is killed by The Joker. (Couple weeks later) Jason is revived by the Lazarus pit and starts training with the All Castle order.
-(That same year) Tim deduces Bruce’s identity and attempts to become Robin (he might been rejected) and thus becomes Red Robin instead.
-(That same year) Damian shows ups and attempts to impress his father. He becomes sort of a proto-Robin.
-(By the end of the year) Jason returns as Red Hood and meets Star-fire (who was in some sort of relationship with Dick). Bruce is lost in time/killed and Dick becomes the new Batman while taking Damian under his wing. Barbara recovers the move of her legs.
-(months or weeks before Batman #1) Bruce returns from the “dead”, sets up to travel across the world to set up Batman Inc.
-NEW 52 #1s!!! Bruce becomes the only Batman once again, Damian becomes his Robin. Dick is back as Nightwing. Barbara becomes Batgirl once again and Jason goes to rescue Roy.
And that’s more or less what I have…of course inconsistencies are still there (like I know Barbara rested for over a year after being cure and before Batgirl #1) but considering that between Justice League #1 and all the others #1’s there is a 5 year gap THERE IS NO WAY that some of the stuff could happened.