Wait for the Raspberry Pi images to complete. Remove the microSD card from your computer and insert it into the Raspberry Pi. Attach your monitor and keyboard to the Pi, you will use them for the initial device configuration.

If you want to use a wired network, connect your ethernet cable to the Pi before booting.

Power up the Pi by connecting it to your USB power supply.

Your Pi will boot, and present you with a series of configuration choices. You need to ensure that the Pi has internet access so that it can get updates and verify your SSH keys. If you need more help there is a tutorial that goes through these steps in more detail.

Next, you will need to enter your Ubuntu cloud account email address. Your Pi will connect to your cloud account and retrieve your SSH keys.