How do I do an instruction page including i.e. one bar with music - explaining how to play the techniques? Also showing the percussion setup on the different systems of a percussion part?
Probably a custom Page Template applied to the page in question.
Here is a Discover Dorico video with John Barron talking about this - although I don’t think he actually uses a music frame in his instruction page -
And a shorter video by Ant Hughes on making an index page ( with music frames, back in version 2 but the principles are the same) -
For just one bar it’s probably simplest to use a graphic slice.
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In this videos of Mr. Hartmann (beginning on 52:10) you can find an example of how to use a separate flow (where you write just the bar with special technique for your instruction) to insert an example in a music frame near a text frame to obtain what you want. It is in German but you can activate English subtitles 
You can make this in an empty instruction page with text frames and music frames (and also save it as template as suggested by other).
I am sure also John Barron or Anthony Hughes made videos of it but cannot find in the moment…
Another idea: You might be able to accomplish one bar with nothing but a font.
Ambitus comes to mind.
Thanks, Ambitus will unfortunately not work because I need quartertone and eight-tone accidentals
Great video thank. I will try to work my way trough it.