"So if I have my receiver set to 5.1, am I going to get the same sound coming out of each speaker or are there going to be different tracks of sound coming out of seperate speakers?"
As noted above, they are different, unique tracks engineered to create the total sound experience. The statement above sums it up well: "5.1 means you have discrete (think tracks) of sound, L,C, R, LR, RR"