Aren't the white walkers and the others the same thing? The others were renamed to white walkers for the tv series. Great show though, I really like this kind of fantasy.
Never read the books, heck I didn't even watch the trailer or read up on the show, and I think I got what all those things you mentioned were, as its.. mentioned or shown in the first episode. SPOILERS OF EP 1 AHEAD. The wall is a border to the north of the seven kingdoms or something right? Guessing by the intro scene its…