And, yes, Finn's characterization won me over mostly because I thought Boyega was quite effective in his role, but I'm hoping for more backstory and information pertaining to his time as a stormtrooper. Nevertheless, I liked the character, mainly for the sheer likability that the actor projected. Like you, I'm not sure how large or small a role Poe, the pilot, will be going forward, but I completely enjoyed him.
In any event, yes, it would be good to learn more about the First Order and Snoke. I'm guessing we'll be given plenty of time with the villains in the next installment for the development of Kylo Ren about which I spoke earlier this evening. My own modest theory is that Rey's visions were a mélange of the present and future, and the future vision was of Kylo Ren and his "Knights of Ren" out in the rain, somewhere, being quite villainous indeed.