Converting a PHP set of pages to WordPress

Hi, I have a site that was developed for me in php and I want to convert it to wordpress but not sure how best to do this so any help would be appreciated. On the first page is an iframe that has a series of images and when clicked on they go to another page that then connects to other pages for information. Here is the php site: https://mirrorofrace.org/container.php
I would like to have these all using the current wordpress site which is now at https://mirrorofrace.org. You will see however when you go to Exhibitions and then Main Exhibition it goes to the old site. Not being familiar enough with php I’m not sure how to call those pages into wordpress.

Thanks
Derek