Lt. Hija said:
The other thing is that Kylo has somehow acquired the helmet of Darth Vader from the burial site on Endor
I think that could be a possible opening scene. An unknown person going through the long-overgrown cremation site looking for the helmet. An introduction giving us a look at how there is a new foe who not only believes in what Vader was but is also more than just a little off-center in his admiration of him.