Capacitance, magnitude of charge, stored energy, electric field, and energy density?

A parallel-plate air-filled capacitor having an area of 40 cm^2 and plate spacing 1.0 mm is charged to a potential difference of 600V. Find (a) capacitance, (b) the magnitude of the charge on each plate, (c) the stored energy, (d) the electric field between the plates, and (e) the energy density between the plates.