This post points to the next three videos in the Flask series.
The first covers setting up a droplet (virtual server) on DigitalOcean. The second, deploying a flask application using Green Unicorn, and the third, using sshfs to remotely mount your files from your DO box to your local machine and how to set up DNS using FreeDNS.
To help you on your way with DigitalOcean, here are links to a few of their tutorials
In general, there are lots of great tutorials and guides at the Digital Ocean Community.