The first and third are examples of kinetic typography and AE tuts has this TUTORIAL on the techniques. If you google "kinetic typography tutorial" you can find more examples.
If you are new to AE, I would strongly suggest you start HERE, Todd Kopriva has gathered a lot of information for people who are just starting out. If you try to jump into this program without learning the basics, you are going to get very frustrated pretty quickly. Half down the page are two very good introductory courses for learning AE for free online, Andrew Devis(Creative Cow) and one from Andrew Kramer(VideoCopilot). Both the Cow and VideoCopilot have hundreds of tutorials from begginer to advance You should check them out.
Johnny Cuevas, Editor
"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.