ups, I messed up my answer!
You import your .mov movie in the same way you import anything to Flash with "File>Import" option.
your movie must have the frames needed to play the complete movie (by this I mean, if your .mov is at a frame rate of 25fps and it has 30 sec's you must put your .fla at the frame rate of 25 fps and have those same 30 sec's), it should be around 750 frames for this example.(25fps*30''=750frames)
Any other thing just ask...