1. Node.js is an open source, JavaScript-based, server-side environment. Npm is a package manager for JavaScript.
2. You can find the installation packages and instructions for installing these on multiple operating systems at https://nodejs.org/en/download.

3. Visual Studio Code (VS Code) is an open source code editor for multiple programming languages.
4. You can find the installation packages and instructions for installing this on multiple operating systems at https://code.visualstudio.com.
5. You can create an app using the npx create-react-app projectname command.
6. You can run the app using the npm start or yarn start command.
7. You can start by modifying the App.js file, and when you save the modification, you will see the changes immediately in the web browser.