Step by step setup guide

raspi-config

First, set up the camera, the RAM split and expand the disk with the rpi-config command:

pi@raspberrypi:~ $ sudo raspi-config

First set up camera with option 5:

Then choose P1 Camera:

Then go back to the main screen and choose option 7:

First Expand Filesystem A1:

Then return to option 7 again and choose A3 memory split:

Set this to 256 and then exit raspi-config. When prompted to restart, select yes - this is to ensure the disk is resized before we updated.

First install screen, so that you don't have to worry about a disconnect mid update:

pi@raspberrypi:~ $ sudo apt update && sudo apt install screen -y

Then start screen and update:

pi@raspberrypi:~ $ screen
pi@raspberrypi:~ $ sudo apt upgrade -y

Then, once it's finished, another reboot.