The audio I imported doesn't seem to play wherever the time line header is located. It seems, in order for me to hear the audio, I have to start the audio track at the beginning. How come? Why won't the audio play wherever the time line header is located?
This would be a great time to check the help files. Just press f1 and then search for audio preview.
The . key on the numeric keyboard will preview audio from your current position, the 0 key on the numeric keypad will preview audio and video from the start of the work area unless you have set play from current time in the player control window.
All of this and more is easily found in the help file.