Okay IF you have DARK hair as in it being brownish darkish and then you want to dye it blonde and then brown like an ash brown or light brown what color should it come out?

I have a dark hair color it looks brown/black and I want to dye it but I want it to come out as a light brown blondish color and someone told me to dye it blonde and then brown but don't let the brown stay in too much. Im lost.