Here’s what I did for one of my sites—greatly simplified, of course. This is for a page where the url_title appears in the URL.
The entry shows here:
{exp:weblog:entries weblog="stories" limit="1" disable="trackbacks"}
<h1>{title}</h1>
<div class="byline">
<h2><span class="date">{entry_date format="%F %j, %Y"}</span> | by <a href="/user/{username}/">{author}</a></h2>
<p> </div><br />
<div class="story-body"><br />
{stories_body}<br />
</div><br />
{/exp:weblog:entries}
Below this, I have my comments, both the existing comments and the comments form. Since I only allow members to post a comment, I didn’t need to add the fields for name and email address.
{!-- COMMENTS LIST --}
<h3 id="comment">Comments</h3>
<ol>
{exp:comment:entries weblog="stories" url_title="{segment_3}"}
<li id="{comment_id}">
{comment}
</li>
{/exp:comment:entries}
</ol>
{!-- COMMENT FORM --}
{exp:comment:form}
<h3 id="post-comment">Post a Comment</h3>
<fieldset>
<label for="post-comment-text">Your Comment</label>
<textarea id="post-comment-text" name="comment" cols="20" rows="5">{comment}</textarea>
<input type="checkbox" id="notify-comment" name="notify_me" value="yes" {notify_me} />
<label class="check" for="notify-comment">Notify me of follow-up comments?</label>
<input type="image" name="submit" src="/css/i/btn-postcomment.gif" alt="Post Comment" />
</fieldset>
{/exp:comment:form}
Hope this helps!