The best thing Disney can do

Have an animated series similar to the Clone Wars series that details the events leading up the Force Awakens. You can have Luke training Ben, you can build up Snoke as a character, you can show how the First Order came to be.

I would have liked to see an exploration of Kylo and Snoke's past and their dynamic, we learn where Snoke was during the reign of the Empire, possibly it would be explained that he was aware of the true nature of the chosen one prophecy that the two equivalents of light and dark would have to destroy one another in order to bring balance to the force, so he waited in the wings for the prophecy to be fulfilled by Vader and once Palpatine was killed, he took this opportunity to rise and take his place as the Supreme leader. Snoke would use Hux as the face of the First Order until turning Ben solo to the dark side.

We would see Luke sensing the anger and the hatred in Ben. Luke attempts to teach him calmness and patience, but Ben is shown to be the weakest of Luke's Jedi students, who have been able to demonstrate a great use of the force, unlike Ben who can barely focus enough to move a boulder from the entrance of a cave.

Snoke would communicate with Ben in his dreams using the image of Anakin and through Force/lucid dreaming Ben would give in to his hate and anger and is now able to obliterate the boulder, his anger brings down Luke's home, crushing him leading the other students to think Ben killed Luke. The students would attempt to destroy Ben but he would slaughter them all, except a few who become the Knights of Ren. "Anakin" would inform Ben of a powerful master Snoke.

The show ends with Ben turning to the dark side, Luke heading in to exile. That way the history is laid out between Luke, Ben and Snoke as well as the effect it has on Han and Leia.