There are many examples in this forum like this :
Use “-” before the IFCIMPORT command to be sure to run it from the command line and not from the dialogue window. This applies only to commands like this or the View command for example, that have a dialogue window.
Use “\n” as the equivalent of enter.
For example if you want to send the AECPSDAUTOATTACH to the command line you will need this as the command to send :
"AECPSDAUTOATTACH\nON\n"
There aren’t many ressources out there for python with Dynamo and Civil 3D other than this forum. But there is already a wealth of information here. Users such as @Paolo_Emilio_Serra1, @mzjensen or @hosneyalaa have posted a lot of python examples here. Finally, if you speak spanish, I did an AU class in spanish this year on the subject :
El poder de la automatización: Python en Dynamo para Revit y Civil 3D (SD500080)