1- Who is Rey? My wife and I both think she is Luke's daughter. Seems like when Kylo was working his force on her he mentioned an island (presumably the island Luke was on), she is born with the force and very strong (matches a trained Ren). Another idea was that R2 was in low power mode until she came because she has the blood of Luke inside her. Luke would have wanted her hidden so that she was not turned the way Ren was.

2- did the super sized Death Star planet completely obliterate the sun of that planet in order to power up its weapon? Seems kinda useless if so. With no sin the temperature would drop incredibly low destroying all life on that planet.

3- so are there no other Jedi left if Kylo destroyed them all?

4- Is Kylo a Sith? Or are the "Knights of Ren" some other group?

Overall I thought it was like a 2015 version of a New Hope. But I still loved it and will see it again in the theatre.