Zend certified PHP/Magento developer

Send email to specific email after order is placed in Magento 2?

I have added 3 custom attribute fields to Magento 2:

special_email, special_subject, and special_message

These 3 fields are filled out in the Magento 2 admin on a per product basis.

What I want to do is, if an order is placed for any product that has those fields filled out, then use those fields to send an email to the special_email address with a subject of special_subject and a message of special_message

So the part that I’m unsure of is what file to create and what code to use.

I have created a folder in: app/code/{vendor}/Specialproduct

Where do I go from here?

Thank you.