IPS does not officially support nginx. You would want to use the latest stable Apache. With IPB 4.7, PHP 8.0.X is recommended. You can use 7.4, but it will eventually be deprecated. I generally recommend using PHP-FPM for better memory management but either is fine really. Regarding MySQL, I would use MySQL 5.7. 8 generally works but I’ve seen a few gotchas so I would just stick with it since it’s known to be pretty rock solid.
You can check if your environment meets IPS requirements with the following script:
If you are not comfortable being a system admin, you might not want to use an unmanaged host. Literally you’re responsible for it. IPS is not going to support you configuring your server. If it won’t work and it’s a server issue, they’re going to tell you to talk to your host. That means in an unmanaged scenario “good luck you’re on you’re own.”