Hello How would I set it up so that when a visitor fills out a form (ex. when signing up for a membership), the information is added to a table in my mySQL database as well as emailed to me?
Well, You will have to use mysql_query() and mail function. Check out this tutorial. I shows how to insert into database, etc. http://www.zend.com/zend/tut/tutorial-jenkins.php.
For the email part just checkout the mail() function on http://www.php.net/mail
Good luck.