Data Flow and Data Store Modeling

I and a colleague are trying to learn BPMN so that we can do Data Flow and Data Store Modeling to integrate it into an existing BPMN Process Model. I am looking for a step by step guide with screen shots to show me how to use MagicDraw 18.5 to: 1) create a business data diagram; 2) create and insert data objects; 3) create and insert data stores; 4) create associations between data objects and process sequences; 5) map data fields to a business data diagram; 6) update a data structure; and 7) create relationships within a business data diagram.