Wordpress form handling
You can create a page template in the theme folder you are using that can handle this. Simply add your custom PHP code and xHTML mark up for the form. When setting the form action all you should have to do is set it to post and the page will post to itself. This may require you to add some additional logic to see if the $_POST vars are set and to process them if they are, but it's easy, clean, and will also let you give the user a status message if you are doing any kind of success/failure checking.
Alternatively you could look to using the following plugins that make this a cinch:
- Cforms II
- Contact Form 7
- Gravity Forms (Premium Plugin)