Hi JeLoMa,
there is the “SMTG_MYPLUGINS_SRC_PATH” variable for cmake. There you can set a custom path to your plug-ins. If you have downloaded the SDK from the steinberg.net side then the variable is setup so that the plug-ins in the folder “my_plugins” are build. You just can copy one of the example plug-in folders (for example helloworld) and change the files accordingly.
I hope this helps,
Arne