I would use create-react-app (https://github.com/facebook/create-react-app) and then bring your existing code into the created project.
create-react-app will give you everything you need to run your react app locally, and also build when you are ready to deploy.
npm start and
npm run build respectively
When you run the command
npm start your code will be transpiled from jsx to js on the fly. So no need for a .babel file, just copy and paste your code into the app.js file.
Traverse media is usually a great source of info.
Thanks for the link. I’ll have a look.