Where to begin when hosting a largescale webapp?

I've been looking for resources on how to host a large, non-static webapp with a Laravel backend and using MySQL for a database.

I'm looking on how to host a web app with 10,000-300,000 users active daily, however cannot find any good resources online and I honestly have no idea where to start. I am looking for something that is scalable. Each page is around average 12.5 megabytes and each entry in my database is on average 1500 bytes.

Are their resources that exist for applications like this? Or would I have to use my own equipment to host my application