1) Most of the Imperial Fleet was destroyed at Endor. How did this Imperial Star Destroyer end up on Tatooine? Has it been sitting there for 30 years since a post Endor Battle (Tatooine is a long way from the core and the Imperial Remnant) or does its crash form part of the narrative of the film?
Edit: A friend has informed me that the planet depicted in this scene is not Tatooine. It is a new planet called Jakku and is the home of Rey. The Star Destroyer has clearly been at rest on the plannet for quite some time so I doubt it's demise will have taken place in the present of the film.
2) "The Force is strong in my family. My father has it. I have it. My sister has it. You have that power too..."