The suggested kits from Arri PCA are decent
The complete list of bits is pretty daunting.
I'd suggest 2x Map-2 , 2x MSB-1 , MVB-1 , Viewfinder , a few lengths of 15mm Rods , and a battery plate as a minimum for essential metal work.
A small usb is good. I have a micro SD card with a small usb adapter and a regular SD adapter for going between a WCU-4 and the mini.
A 19mm BP-8 plate and dovetail would be useful but not essential
at least 4 128gb CF cards + reader
The standard rig from tilta is also pretty good. Other manufacturers seem to have similar options but I don't have much experience with those.
There are a lot of options depending on your needs, shop around. Call dealers and ask questions.
Rent the camera for a job, see what it comes with. What stayed in the box, what did the camera team ask for but not have.
If in doubt, find a local AC that knows the camera well and ask them to spec out an order for you with their dream build and their minimal build