Migrating website from Apache to IIS

Hello everyone,,
One of our departments hosts a web database with a 3rd party vendor on a shared Apache server. Because it's a shared server, they were forced to upgrade their version of php and it broke their site mobdro kodi.
They now want to move the whole website to one of our internal Windows servers where they don't have to worry about forced upgrades breaking anything anymore. The database is purely internal, so they're not worried about security issues with using an older version of PHP and I can limit access so that it can only be reached from within our network.
Anyway, I'm a Windows admin with little experience with Apache. Any ideas on the best way to begin migrating this website over?
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