For more information about how to set up a comfortable environment for developing Plesk extensions, read this Plesk DevBlog article.

The following series of blog posts also demonstrates how to set up the development environment, among other things:

• Part I - Install a local version of Plesk
• Part II - Create extension stub and IDE project
• Part III - My first Plesk extension
• Part IV - List your extension on the official Plesk Extensions Catalog