Hey Judy - good to hear from you again.
Hmm......so there's two things you'd want to send in this case (1) a report turned into a PDF as an attachment; (2) and an Estimate or Invoice as the email body (in HTML).
So, yes, this is *absolutely possible* with customization.
Attaching an PDF to an email is easy. You would just use a Generate Report action, immediately followed by a Send Email action to send the PDF. You can reverse engineer how Work Orders are emailed in Method Field Services to see how that happens.
But creating an invoice via HTML is probably a little more involved - and probably a significant challenge to do on your own for your first client, unless you know some HTML and have a good understanding of Method actions and advanced design concepts. You know the Method invoices you get when you sign up for a Method account, or the invoices you get as a consultant for your user's licenses? Those are just HTML invoices we designed using the EmailTemplates in Method. You'd want to do a similar thing. I don't see a problem with giving you the HTML example of that if you talk to Danny about that.
Paul