Where in the Galaxy is Luke Skywalker?

Who are Rey's parents and why was she on Jakku is on the tip of  nerd tongues everywhere. Come December, we hope to have answers. Most of all, what sent Luke over the edge and sent him into years of exile?

 I have a few theories, canon novel, “Bloodlines,” mentions Ben Solo is away from his family and being trained under Luke at his then-new Jedi Academy. But we later learn Kylo and his Knights of Ren, take over and kill all in sight.

 Is Rey's mother among them?

 From the tidbits in the film and some other audio books, I have no reason to think this is what went down, other than my roving imagination and determination to make sure the theory is not some crackpot, half-assed loser rambling coming from the likes of usual Anal spew of dumb saying Mace Windu/Yoda/Bobba Fett/Gonk droid is Snoke!

 Something utterly devastating must have happened to send Luke into exile and basically turn himself into the galactic Howard Hughes, not seen by anyone for decades, not sure if he's even still alive. Gone so long he's become a legend, whispered about unsure if he even existed as real guy.

  My theory is, Luke had many students in his Jedi Academy, his most promising was nephew Ben Solo., son of his best friend, Han Solo and sister, Leia Organa.

  Somewhere along the way, Kylo and Luke have a conflict of ideas. Perhaps Kylo feels he's being held back, not being taught what he wants to know- even worse, maybe he becomes intoxicated with the cult of personality surrounded by his grandfather,Anakin Skywalker/Darth Vader. The allure of the Sith is too much, the coveting of power by the young one flips the switch and he enlists several other students, who feel the same way- Christened as The Knight of Ren, Founder Kylo Ren goes on an ape shit tear and begins striking down all who stand in his way. His first target is Uncle Luke. Being half Skwalker. He hates all he stands for- reasons we have yet to know, he wants to kill him for some perceived slight. He tries- Luke is knocked out, his Academy destroyed, both in figurative and literal sense. Kylo kills all the students, mows them all down. One refuses to die- Luke's wife; in the crappy old EU it was Mara Jade – in the new canon, we have no clue. Perhaps she stands in defense of their daughter REY- Kylo and the Knights kill mother and out of sheer spite, steal REY and spirit her off to the planet of Jakku- Luke fears she's dead, but has no real clue. Not wanting to put his sister and the Resistance in the spotlight, he hides away. He spends his time in exile, trying to communicate with his daughter, not sure if she's dead or alive, but has no clue where she is. Meanwhile the Knights of Ren and Kylo burn the Jedi Academy out of existence and make Luke the most wanted man in the galaxy. Han Solo runs off to help find Rey and to soothe the heartache created by his son's betrayal.

Although Kylo acted a little surprised by Rey's appearance in TFA; maybe he left it up to someone else to dispose of her, maybe they were suppose to kill her and instead stole her from Kylo- Lars San Tekka, perhaps?

  If these questions aren't answered, The Last Jedi could possibly be considered a failure. I doubt any of this happens, but these are merely my musings, I have no way to know how this will turn out, but the days are slowly coming towards us to find out. Can't wait.