Dynamics 365 has had a lot of great functionality added within the last few months. So, Microsoft has a whole site dedicated to documentation. I would recommend that you review this site to assist you with Dynamics 365.
The reason for mentioning this site is that buried in there is a great little nugget of “Create a quote PDF”: https://docs.microsoft.com/en-us/dynamics365/customer-engagement/sales-professional/create-quote-pdf-sales-professional
NOTE: You will need to be on Dynamics 365 version 9.0.1905.2010 or greater. If you have the October 2019 update installed, this feature is automatically enabled.
But, you may be asking, “How do I get this feature?”. Well, I’m glad you asked!