Without a doubt the best audio and video software is Sony Vegas. I have been using this program for years. It can do anything you need it too. Cut clips, edit clips, motion capture, add captions, have layers of video and auduo clips. Sony Vegas is a professional level editing software that is easy to use. You can find many tutorials on youtube. It is easy to get started and easy to master.
Give it a try:
http://www.sonycreativesoftware.com/vegassoftware
They have a free trail and there are some more permanent solutions available on YouTube.