I assume you want the spotlight to follow your mouse cursor on the floor or ground, correct? if so, look up the function ScreenPointToRay() in Camera.. also Physics.Raycast. You will get a ray from ScreenPointToRay and then do a raycast and find the RaycastHit point and then that would be the point in world space that the spotlight would shine .
Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
RaycastHit hit;
if(Physics.Raycast(ray, out hit)
{
// make the spotlight do whatever using hit.point
}
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