Prerequisites
There're not too many of them, but here are the prerequisites in order to help you get started:
You'll need one Windows computer where the server runs. There is an exception: You are familiar with Python. In that case, you will most likely get it running on Mac/Linux.
You'll need a WiFi if you want to control the app on a different device than where the audience screen is running. It must be set to private mode. See this explanation to find out how to set it to private mode.
You'll need an up-to-date browser. It is tested in Chrome, nothing else at this point. I'd be happy to hear about experiences with other browsers such as Opera, Safari, Edge, Firefox, ...
If you have more questions or struggle at any point, first check out the raq and if there's no solution to your problem, contact me on twttr.