How to copy search database into new WP site?

I’m renewing a website and I want to use WP as a base for the new website, which i will be hosting at my own webhosting.
However, I have a lot of trouble copying one certain section to WP.

This is a search page to look for rooms, sizes etc in a database. How do I copy this searh form into WP and direct it to the right database??
thanks a lot!