Welcome to the Community! It is a great place to gather some input regarding anything about the platform!
With regards to your inquiry, the amount of revenue a business makes depends on a lot of things but you can certainly make a good living from a dropshipping store. Before we focus on sales, I suggest you focus first on creating a great store that showcase great products.
I have attached some resources to help you get started in this:
Please give these resources a review as they will provide you with valuable information regarding this kind of business model. Definitely let me know how these work out to what you are looking for. I am more than happy to assist you further.