I always tell artists that ask that question you figure time and material. What is your worth per hour . it sounds like it would be a full time job with all those duties. So think about what you should be paid by the hour if you worked somewhere else $ 8.00 $10.00 $15.00 dollars an hour and then add up how many hours you put in for the month and then that will be your answer.
You keep track of all the hours you put in and at months end you add them up and that is what you ask for as if you were being paid by the hours worked.The hourly figure is totally up to you to decide what your worth is.