How to make a buffer solution?

you have three bottles, one filled with 1M NaAc ( sodium acetate ) one filled with 1M HAc ( acetic acid ), and one filled with distilled water. you need to create a buffer solution that has a pH of 4.75 such that when 1 ml of 10 M HCl is added to your buffer, the resulting pH is 3.75, what concentrations of HAc and NaAc do you need to create the buffer solution