3.) How do I change the auto subject line that goes to my client (Doyle) after their customer submits a form? 

3.) How do I change the auto subject line that goes to my client (Doyle) after their customer submits a form? 

If you create a Notification which goes to you or an Autoresponder that goes to your customer you can then edit those further changing the Template to your liking. This includes the Name of the email that is sent out along with its Title.