on form_page.php do the form code
on form_page_action.php write the code to accept the form and collect the values
form_page_action.php
// get all values
$date_submitted = date("Y-m-d H:i:s");
//now from the author name in the dropdown get the author name say $author.
// insert into datbase all the values
// get who to mail to and use it in the mail function
$mail_to = $author."@domain.com"
// use mail() function to mail the author
http://www.php.net/manual/function.mail.php
this should get you started. hope you dont expect us to write the whole code for you
reg
kevin