If you want to make beeps, go into setting and taking photos with your system of beeps fully audible.
It seems DSLR cameras are set up by their manufacturers so shutter button handles both the focusing part.
This relates to how the autofocus system works. You may have the experience of turning on a DSLR.
Versatile Camera Lenses for Travel Photographers. I believe that a lens is more important than the camera.