I have started with a new plugin and put code in it but I don't (seem) to have access to it

I have selected the type that supports Blueprint nodes. I couldn’t really get them to work. I have the blueprint template and PyInterface which has the type FPyInterfaceModule so I include the PyInterface file and construct a type of FPyInterfaceModule it is only active with the file included but I get an error that it is not found. What I could use a good tutorial about the things that I have covered here, but I cannot seem to find it.

Thank you.