WordPress comes with a file
wp-rss2.php that creates RSS 2.0 feeds for entries and a file
wp-commentsrss2.php that creates RSS 2.0 feeds for the comments. Links to these files are already included in most templates, so you don't have to do anything to set them up.
If you're using permalinks, and your blog is at
www.example.com, then your entries feed is at
www.example.com/feed and your comments feed is at
However, in the default template, the feed links are prefixed with a new protocol
feed: that has yet to be fully implemented. You should open up
footer.php and delete the
feed: in front of any links there.