The Project Spark beta launches on Xbox One today. Sign up to join in.
The beta has been available on Windows 8.1 since December, so there are plenty of guides, as well as games made by other people, already out there.
Encouragingly, there's also cross-platform support and Cloud Saving, so you can make something on a Windows 8.1 device then play it on Xbox One, or vice versa.
Project Spark, made by Team Dakota, is a friendly and apparently powerful toolset with which to make - and share - your own games. The full game launches "later this year".