There are already several addon's to Business Central that does similar things. Except maybe the print.
Readsoft online is part of the standard functionality and can help you get far with your request.
But if i should create this functionality myself i think my approach would be something like:
Use Power Automate to fetch the attachment from the email and save it to a Azure blob storage.
Use the Azure blob managemt codeunit in AL to load the attachments into AL.
Write AL code that print the document, you will probably have to use universal printing for this.
But i would really look into the existing addons. Starting with the OCR service that is a part of standard BC.
