Creating a shared drive for multiple iMac users on iCloud

I currently use an IMac which is connected to my iCloud account. I am going into business with my wife and another person who will both user new IMacs. In layman’s terms I want to continue with my own iCloud account, but create some kind of shared drive where the two new users can access files and can upload their files to this place . How can this be done please in very easy language and simple steps thank you

[Re-Titled by Moderator]