RaspberryPi4 RPi4 Upgrading from existing SD card setup to boot from SSD

joulinar i think my previous mistakes fd up my software, you remember from that post with iptables? I can update but my pi fails reboot. What are the most important things for me to save on my computer before wiping the SSD, and how do I make it so that when I do flash the image onto the SSD, the pi boots from USB? As you have to enable that option.