Help with keeping camera tracking

I have created a model and want to do some simple animation, so I selected the camera and all the parts that make up the model. When I select lock to constant the model turns through 90 degrees. When I move the camera it then just seams to point at the light source and not the model.

Thanks for Looking

Use the TrackTo constraint. Then in the Anim tab in F7 use the Track and Up buttons to get the coordinates.