Career Change

I would like to start a dropshipping business using Shopify but I am only a beginner and the only things I know about this business is what I've learned through YouTube videos and other research this past week. Based on what I have seen and read so far I have taken some steps to get the process started but have no doubt I'm making mistakes. Before I create an even bigger mess I need a Shopify expert to analyze my current store and advise what needs to be done to build a solid foundation for a highly successful business. Some steps I have already taken include: 1) Creating the Shopify store - I hired a company called Debutify to help me develop the theme and get products to my store. I realize now I made a mistake while doing this. Not having proper knowledge of setting up a Shopify store I thought I wanted multiple categories of products so I placed multiple orders with Debutify to add products from multiple categories. My first category I selected was Health and Fitness. Other selections were things like electronics, beauty supplies, women's clothing, etc... Debutify also had me download Spocket app to get the products. What I have now is the Health and Fitness theme but products from all the other categories in the store as well. 2) I have downloaded multiple apps but I'm not sure I really need all of them and some may provide the same functions as others. 3) I have also connected to FaceBook because I want to have a highly successful FaceBook ad campaign. I have the FB page setup with basically just a logo at this time and I could use some help developing this page. 4) I'm currently on the Shopify Plan but considering an upgrade to the Advanced Shopify Plan; primarily due to my inexperience in establishing shipping and delivery costs. In a nutshell I want to develop a successful online business that I can work at full time and one day pass down to my children. I need a true expert in all things related to establishing a successful business such as this from store development and management to successful ad campaigns and more. I would also like to sell products globally, not just US, UK and Canada. Video of current store attached. Store is not live at this time.