Basic question regarding Abobe After Effects?

I have CS5, for a undertaking, I have got gotten lots of clips by different sources build.My dilemma is, just how do i make all of the clips exactly the same size.

I possess After Outcomes CS4 but it should be exactly the same (I really need to update that will CS5 but We would like new hardware to accomplish so).However, resizing clips is actually simple and also all you must should want to do is visit the clip you would like to resize as well as a little resize package should appear round the edge of it and you also can click and drag it into the size you need.

Shrink these people.