Before moving a camera, choose a view other than Active Camera. If you use Active Camera view, you are looking through the camera, which makes it harder to manage.
By default, a camera's wireframe is only visible when the camera is selected. To always show the camera wireframe, set the view options for the Composition panel (View > View Options). (See Show or hide layer controls in the Composition panel.)
When working with a camera or light layer, create a null object layer and use an expression to link the Point Of Interest property of the camera or light to the Position property of the null layer. Then, you can animate the Point Of Interest property by moving the null object. It is often easier to select and see a null object than it is to select and see the point of interest.
In After Effects, there is a camera command, “Create Orbit Null.” This parents the selected camera layer to a new null layer. The new null layer is renamed, based on the camera’s name appended with Orbit Null
Trish and Chris Meyer show you how to use the Create Orbit Null camera command in this video tutorial on Adobe TV.
For a video tutorial that shows how to create and modify a camera and use the Camera tools, see the Adobe website.
Trish and Chris Meyer provide a tutorial for using 3D layers, lights, and cameras in a PDF excerpt from their book After Effects Apprentice on the Focal Press website.
Mark Christiansen provides tips and detailed techniques for working with cameras in the “Virtual Cinematography in After Effects” chapter of After Effects Studio Techniques on the Peachpit Press website. This chapter includes information about matching lens distortion, performing camera moves, performing camera projection (camera mapping), using rack focus, creating boke blur, using grain, and choosing a frame rate to match your story-telling.
Richard Harrington provides a video tutorial on the Creative COW website that shows how to use the Camera tools and camera views in After Effects to create a camera move with 3D layers. (This tutorial is the second in a two-part series. Part 1 concentrates on working with photographs to isolate and create sky in Photoshop for use in After Effects.)
Rich Young provides a set of expressions on his AE Portal website that use the toWorld method link a camera and light to a layer with the CC Sphere effect.
Andrew Devis of Creative Cow has created a 3 tutorial series on Animating a Camera: