There's a theory about Kylo Ren, and I extended it with my own ideas of what's going to happen IF the theory has any truth in it:
Spoiler
Remember when Kylo Ren/Ben Solo talks to Vaders helmet, "I'm going to finish... what you started." Most people assume this means he wants to become the next Vader. Doesn't make much sense, surely Leia and Han must've told him how Vader returned to the "light side"? Well, there's theor(ies) that by finishing what Vader started, he means killing Snoke (Plagueis?), just like Vader killed Sidious and bringing true balance to the force. He knows (or assumes) Snoke is weak, but he had to turn to the dark side to get himself where Snoke is. This is why he's feeling "torn apart" and constantly trying to keep the light side from showing through and trying to fuel the dark side with rage.
This is why he's having conflicting feelings before killing Han. Maybe he is actually able to get inside Han's mind there (he obviously has that ability) and tell him his true mission. This is why he says thank you to Han after piercing him with his lightsaber.
Now here's what I believe if that theory is true (and it does have a lot of holes in it): Kylo Ren is underestimating Snoke's knowledge of the force (doesn't realize that he's actually the most powerful Sith there has ever been). Snoke has foreseen Kylos plans and after asking for the First Order to bring Kylo to him, he's going to slaughter him in EP8. "Kylo Ren, your training is finished..." *tortures with force lightning to death*
After this it will be up to Ren, Finn, Luke and others to destroy Snoke and the First Order.
