music while movie is playing?

hi my name is X i have a quick ? for anyone who can help i am macking a movie in my class and i want music to play while the movie is playing(that means having everything in my movie, for example a person walking, working and the music playing in the background durring the movie). so how would i go about doing this. oh and one more thing how do i make an openning title like the one in the toturials , for defending nap time, ya know the one with the bunny. any help to ethier of these would be greatly appreciated.