It's really not difficult enough to make a tutorial on it. I mean, it's fairly straightforward.
Take a look at any RSS feed. Copy and paste your content into a text file that looks more or less the same.
After you make your file, use the RSS importer to import it into WordPress.
Example RSS file:
<rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/">
<title>Name of Post</title>
<pubDate>Fri, 22 Feb 2008 18:12:16 +0000</pubDate>
<description>Content of post goes here.</description>
... next item ...