First of all we need to access our newly started instance. We need to find the machine's IP and then connect to the admin console.
If you started your image in Virtualbox, you can login using the TTY, the machine's default username/password is:
Once connected, run
ifconfig to get the machines public IP address, so that you can connect to the web console.
Once you've found the IP address simply paste the IP into your browser's URL and you should be redirected to a page that looks like:
Simply follow the steps on the welcome to finish the setup.
You may want to setup a Data Disk, simplifying backups and upgrades.