You can drop cameras into a chor anytime you like. You switch among them by hitting the 1 key on the keypad, it cycles among the various cameras. then select the camera you want to render from, render the frames you need, then render additional frames from the next camera you want. You'll need to composite them in post, which can be done right in AM or with another app like QuickTimePro or After Effects.
To aim the camera at a character: In the chor, right click on the camera, select new constraint, and choose "aim at", and use the resulting eyedropper to select the character. You may need to adjust the offsets, as the camera will aim at the model bone which is often at foot-level. But just adjust the Y-offset to focus the camera on the head, face, etc.
These are both simple operations. Good luck! Come back with any questions.
Really thanks alot!!! :D