How do i drag a javascript file to a camera?

You can always click on the item, up top it'll have the components, go to scripts, and then add it that way.

I tried that. I click NearCamera. Then I go to Component, third Person Camera -> spring follow camera, and then click it....... and nothing happens.

I actually got a little confused by this too (I'm also new to Unity =S). The SpringFollowCamera script will show up in the inspector after you drag it onto the NearCamera object in the Hierarchy. It doesn't show up in the actual Hierarchy window.