On your first SSH login to the VM, you will be greeted by a setup wizard that will create a working Mastodon server. Going in, you need to be prepared to enter the following information:
1- The domain name (the DNS records should already point to the VM)
2- SMTP credentials for sending e-mails (this can be SparkPost, Sendgrid, Mailgun, etc)
3- Optional: Amazon S3 credentials for storing user-uploaded files (this can also be Wasabi or Minio)