you can play player vs. player on nba2k11 by just plugging in two controllers then go to quick game and there will be one red controller and one blue controller on the screen
That is purely a matter of personal preference. There are people who would argue passionately that only "who" is permitted, but there is no rule saying so.
Follow the instructions in the manual that came with the CD player. If you have no manual then you will need to find the instructions for the particular model you have.