DSC problem: no .mof file created

I try to create a .mof file to test DSC on a Windows server 2012 R2 server.

I think I installed all the requred components (where can I locate a complete list?) and I can create .ps1 files or paste files from samples.

When I run the .ps1 file I get no error message but no .mof file is created.

I presume I missed some relevant point, but how can I troubleshoot my problem?

Event logs don't show anything meaningful.

Is there a step-by-step guide to create DSC .mof files?

Is there a checklist ti see what is missing?

Regards

mario