Regulatorily, he's there to avoid you hitting another aircraft (or possibly entering IMC without a clearance that would preclude him from doing so).The trouble is, you need to develop your own curriculum, and tasks/goals for the flight. The person in the right seat should not be giving any advice or criticism. His goal is to simply keep the two of you from becoming a smoking hole. .
If you can't handle the aircraft without losing control of it, the person you want in the right seat is not a "safety pilot" but rather an instructor.