I'm a beginner myself, but I just wanted to share with you this cool stuff I learned the other night at the Motion Graphics Los Angeles meeting. This is just some examples of EXTREMELY easy AE expressions, and hopefully will introduce you to what AE is really capable of. These expressions I learned from Alex over at www.editableae.com, and there are SO MANY more cool things that can be found there! Go check it out!!
The first one shows a SUPER simple expression for introducing a handheld-camera type movement to a movie or image. You'll also see how it can easily be adjusted to make anything from a nice floating motion to severe, crazy shaking.
Medical Motion Graphics