You must choose a Digital Ocean plan with at least 2GB of RAM when creating your VM.
After creating your VM:
1- Create a DNS record for a hostname pointing to your new VM_IP
2- Login to your new VM via SSH and follow the short configuration script. That’s it! Your new Zulip chat server is now ready for use. If you’re running this as a production server, we recommend skimming our extensive docs on configuring Zulip, upgrading, backups, monitoring, security, and more.