nightwulfe:
You're going to want to use something more like Adobe Premiere, or another video editing package to do that. After Effects is great for adding special FX/visuals, but you need a video editing suite to do what you want.
If you've never done anything like that before, your best bet it to search the internet for as many tutorials as you can to start understanding how the software works and to start experimenting and learning. There's no easy step-by-step guide for doing something like that.