Extend Coal Baron The great card game for 5, 6 players

[tranhuythang]

Hello,
I am from Asia, can't speak your langauge, but like this forum very much, especially the PnP section.
I have a question before printing out the Coal Baron - The Great Card game.

I want to make a 5,6-player game, so what extra cards should I print more?
I know at least i need worker cards for a player, but what about other cards.
Thank you.