I am going to do my best to explain Smeagol/Gollum in the brief amount of time I have. He used to be one of the 'river folk', which is to say more or less a hobbit, just like Frodo and Sam. He was a decent chap, not a bad fellow until he was out on the river one day with his friend Deagol. Deagol found something on the bottom of the river, which turned out to be "The One Ring" which was lost by Isildor many years before. It's power was so potent that it drove Smeagol to murder Deagol for the ring only minutes after it was found! He made up a story about how Deagol had given it to him for his "birthday". Then henceforth, it was known as his "precious". He turned into a liar, a thief, and a trickster and was more or less shunned by all those around him. He took to hiding in dark places, and would gurgle the word "Gollum" in his throat and people began calling him that. He fled to under the Misty Mountains and stayed in a cave for over 500 years. The ring tormented his soul, and gave him unatural long life. Eventaully, the ring left him and came to Bilbo, and the rest we all know well enough I think. Basically, Smeagol is a tormented creature with spilt personalities. There's the inner good "Smeagol" who is trying to shake the evil ring personality known as "Gollum". That's why he's always talking as "us", seeing as he is basically two different characters altogether. I probably am confusing you more, but I hope you get some of what I'm saying!