Premiere Pro CS6 Techniques: 85 Audio 15: The Submix

[Nqrgaard]

Thanks.
What is the best way to make the same audio level for different audio files?
I have 11 scenes in my movie, which i have edited and mastered in ProTools (11 ProTools projects), but i don't know how to get the same audio volume. I know they don't have the same level. How can i make sure that these audio levels are the same, and what audio level should a movie have?
I want to get all the video files and audio files together in Premiere Pro