Exporting to replace existing non-Wordpress site

I’m in the process of building a Wordpress site with Local by Flywheel. The site, for a small theatre company in Australia, is to replace an existing out-of-date site built with another (non-Wordpress) application. I would prefer to retain our current internet service provider and current domain name. What details do I need from the ISP and then, is the Export command all I need?