Hi everyone,
to get started with PanoPainter you can find the official tutorials here: https://panopainter.com/tutorial.html
Brushes
PanoPainter does not ship with a default set of brush presets, yet. So in order to have a nice collection of brushes you can easily import them from Photoshop ABR brushes from your collection or find some good ones like Jama's ink brushes that you can download from http://jamajurabaev.com/resources/
To import just click on File -> Import and select an ABR file.