Better yet....for a quick start, download the DP2SceneGraph wizard in my signature below. It will create a new channel for you in a short amount of time. You can then browse through the generated Brightscript source code using Visual Studio Code or some other editor to lean how it all works.
FREE Windows desktop software for converting Direct Publisher channels to SceneGraph (SDK), for creating
BIF (Trick Play) files,
Roku (MRSS, JSON) feed files, and
FireTV feed files @
GitHub/rrirower.