Difference between whonix gateway and workstation? What is needed for kali

So was trying to set up Kali to run through whonix on virtualbox. I downloaded whonix XFCE linux for VBOX and imported it into virtualbox. Once that is done can i get rid of the workstation since i would just be using Kali for that or do i still need that? All I need is gateway right. If anyone can point me to up to date instructions on running Kali through virtualbox I would appreciate it. Thank you.