The best approach to the camera is to use two of them. You can only render from one camera but you can use the various cameras while you work. I suggest you use the main camera for viewing and poing the world as you create your poses. When you're done, rewind and switch to the Dolly Cam. The Dolly Cam works more like a real camera than the main camera for moving about the scene. Move to the frames you want and then move the dolly cam where you want it. Another good trick is to place camera key frames and go to the edit key frames pane for the camera and set sections to "Constant" this will allow you to make the camera jump from one position to another entirely different place, giving the illusion of multiple cameras being used (like in tv and film)