You can create a new react js app using below commands:
npx create-react-app my-app (This command downloads all required modules/packages to work on react)
npm start ( This command starts the react app ). If browser doesn't open automatically, you need to hit the URL http://localhost:3000/ to see your app.
If your app has been developed and ready to be live on production then you need to run the below command to get minified bundle:
npm run build
You don't need to install Webpack or Babel tools explicitly because they are already available and you just need to focus on coding.