Start by watching this video.
Their github repository:
Which is basically a script Foundry already has a manual process for.
The most difficult part of the process is actually getting an Oracle Cloud account and following the setup instructions.
Your usage may be different and needs be different, but splitting the free resources into two equal servers provides you with two nice servers.
Lastly It is highly recommend doing the following in keeping your server environment up to date.
Log in to the instance periodically with ssh and run the following command:
sudo apt update && sudo apt upgrade -y
Restart the instance in order to apply any potentially pending updates that require a restart.
sudo shutdown -r now
Give the instance a few minutes to restart before trying to reconnect.
Proceed with setting up your Foundry Settings, Modules and Games.