How to work with Webpack server and API

Question

I am the new MEAN stack. I started this pleasant journey with the Angular2 template http://akveo.com/ng2-admin/

However, I had some questions: When I develop the front-end part, I start the webpack-dev server.

• Do I need to run webpack-dev-server when the project is in a production situation?
• If I have a NodeJS API server, do I need to start both "node server" and "npm start" in a production situation?
• As for the file structure, how can I combine the ng2-admin starter (based on Webpack) and the NodeJS API server in the same project?

These questions confuse me so much. Thank you and look forward to your wonderful answers.