Laravel Setup Subdomain for admin

I am looking for a Laravel expert to help me set up a subdomain for the admin section of my website.

You have to tell me steps and I'll do it , If working as desired I'll select and pay you immediately.

I have
http://example.com/public/admin/login
http://example.com/public/admin/users
http://example.com/public/admin/products

I want
http://admin.example.com/login
http://admin.example.com/users
http://admin.example.com/products

Remove public_html in secure way
I want to know where to put code, whether in sub domain or main domain public_html
What changes to do in code