Assuming that you have a Regular Website with html (or any similar variant) pages.
RSS (XML) is like a Data base there are fields and structure that have to be followed, you can not convert regular Website to RSS with a program.
Or you can convert aspect of your Site to RSS feed by using PHP scripting or similar tools it is a real pain in the neck and involves hours of inserting code. Usually end up with a mistake or two and a Non functional feed. In addition regular Web when convert straight to Feed end up been confusing and hard to read.
Here you have a Page that instructs you how to convert.
Link to:
http://kalsey.com/tools/blogfeed/index.php
It Much better to dedicate one special page in you site that is written in XML as an RSS feed or Blog and provides the Highlights that you have to offer with links to the detailed pages.
Here you have a Free Program that would generate an RSS page from scratch.
Link to:
ListGarden RSS Feed Generator Program.
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