Integrate React template with Codeigniter Project

I have purchased a Solution from Codecanyon of Codeigniter. It's for Admin Panel. That's nice. I don't need to edit it. I also buy a React Theme for Ecommerce. Now, I want to get data from API to React. 

How will I setup my Folder? What will be the roadmap? I don't want to know how to call API. 
How will I tempting this React Theme. It has used React CLI.

Now, I have configured that, while you enter the localhost:8080 then it will show `welcom_message.php` page. 

Please help me in advance.

Thanks

You need to contact the author of the Admin Panel, for a documentation on what API request that are available.

Personally I would keep these project separate; One server (Admin Panel) and client (React Theme).