Help me with a Latin translation please, I already have it pieced together, just needs to be revised?

When a man left this earthly life, the shades were led by the god Mercury to the Underworld, the place of the dead, which was said to be under the earth. The King was Pluto, whose wife Prosperine was the daughter of Jupiter and Ceres. The shades were therefore led by the god Mercury, first arriving at the bank of the river Styx, in the kingdom of Pluto. All those coming to the Underworld needed to cross this river.