Henderson-Helbalch equation?

I did an experiment using NaOH and an unknown weak acid and got the following results: pH: 3.15 initial moles acid: 9.8x10^-4 initial moles base: 9.7x10-4. How do I get the number of moles of conjugate base in the equilibrium mixture, number of moles of weak acid in the equilibrium mixture, the molar concentration of weak acid and conjugate base and the ration of the final concentrations? Thanks a lot!!