Acquire an image

https://www.raspberrypi.org/downloads/raspbian/

Burn the .img

On macOS.

Find the dev node for the disk:

# find disk
diskutil list

# unmount disk (eg disk3)
diskutil unmountDisk /dev/rdisk3

# copy image on disk3
sudo dd bs=1m if=~/Downloads/raspbian-stretch-lite-2019-04-08-hkcam-v0.0.8-armv6.img of=/dev/rdisk3 conv=sync

Pre-first-boot modifications:

A bunch of stuff can be enabled or disabled by dropping magic files into the boot partition which save a bunch of time.

WiFi Config

On the SD card, before booting it for the first time:

Create a file on the boot partition called wpa_supplicant.conf with these contents:

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
        ssid="network"
        psk="password"
        id_str="new"
}

Enable SSH

On the SD card, before booting it for the first time:

Touch a file called ssh in the boot folder, this will configure the system to allow ssh.

https://www.raspberrypi.org/documentation/remote-access/ssh/README.md

Enable the camera

sudo raspi-config nonint do_camera 0

https://raspberrypi.stackexchange.com/questions/10357/enable-camera-without-raspi-config/93187#93187

https://www.raspberrypi.org/documentation/configuration/camera.md

Disable the camera LED

First up, we need to edit the config file.

sudo nano /boot/config.txt

Add the following line to the end of the file, then save it.

disable_camera_led=1

https://thepihut.com/blogs/raspberry-pi-tutorials/16043032-stealth-cam-how-to-disable-the-raspberry-pi-camera-led