It looks like your current site is just html with no CMS, so you'd have to copy the content manually.
But you should be able to copy directly into WordPress without going to Notepad first.
It depends on how you want to present the old content. My plan for our site is to have WordPress in a subdirectory with the default pages redirecting into WordPress, but leaving the old site accessible in place. I'll modify the old template so that the navigation makes it easy/obvious how to get to the current (WordPress) site, once it's up, but leaving inter-page links and URLs intact.
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