what kind of lens? should it zoom? should it be pannable and zoomable over the internet? what resolution? VGA? full HD? 2.5K? motion detection? microphone?

what kind of lens? should it zoom? should it be pannable and zoomable over the internet? what resolution? VGA? full HD? 2.5K? motion detection? microphone? two-way microphone? (i.e. you can yell at the intruder in your kitchen from the comfort of your office)