Teach me dropshipping a - z

My goal with this project is to learn how to start a dropshipping business from scratch. I have some existing knowledge and experience on the subject, however I am looking for a comprehensive explanation to really understand the entire process. I prefer for the project to be in the form of explainging directly. The ideal outcome I am looking for is to understand the most efficient, effective and profitable way to run a successful dropshipping business. I'm hoping to form solid relationships with reliable suppliers that can provide quality products and, most importantly, on-time delivery.