Here's a bunch of info from W3Schools.com... Personally, I learned from cracking open a book and plugging away at the examples, but I don't see why this shouldn't help.
If you'd rather wait, I can build a simple mailing list system, but I have limited time for a little while... it might be faster to do it yourself.
HTML page that is specific to forms:
HTML Forms and Input
Information specific to PHP handling forms:
PHP Forms
PHP file Input/Output (if you are storing the information independent of a database):
PHP File
PHP MySQL info (lots of info, but in the long run, it's easier than using a flat file):
PHP MySQL Introduction
And finally, mailing using PHP:
PHP Mail Functions