Well, Loopsta, you really need to look on the help pages of your ISP - they are sure to have lots of info. The reason people are a bit vague is that each ISP decides how they are going to allow their clients to use the mail gateway and their requirements/setup/locations may be different.
Basically, it should look something like this:
<form method="post" action="
name="yourformname">
<input type="hidden" name="destination" value="you@yourisp.com">
<input type="hidden" name="subject" value="Mail from web page">
<input type="hidden" name="required" value="name,email">
<input type="hidden" name="resultpage" value="
Your Name: <input type="text" name="name" size="45">
Your email address: <input type="text" name="email" size="45">
<input type="submit" name="Submit" value="Send Mail">
<input type="reset" name="Reset" value="Reset">
</form>
The location of the cgi script will be determined by your ISP. The hidden fields are to get the email back to you, put a subject line in your email, and redirect the user to your thankyou page. The text fields is what you've already got presumably. The submit button carries out the "post" action, and reset clears the form.
The advantage of using your ISP's script is that the location is nice and close to your website, but it won't look as pretty as some of those scripts you can get from other services.
Hope that helps.