I have a database with records for parents of our school. we send out bills monthly by printing them out. I would like to begin email it to those parents that choose to receive it by email. Where can I find an easy example of emailing bills from the database for those that request it via email. Thanks.

The invoice starter solution has an example.  If you create a few sample invoices, and go to the Invoice Detail Layout, there is a button to send the invoice by email.  You can open up and check out that script