Ask HN: Resources for Understanding the Data Industry

I am looking for resources to better understand how the data industry works. Specifically I am referring to companies that sell/productize actual data, not data manipulation software (such as databases). Some questions I would like to answer: What data is available, who sells it, who uses it, what is it used for, how much does it cost, what platforms are used to buy/sell data, etc. I am a data science professional that would like to start my own business. I have experience on the technical side (with statistics and forecasting) but I don't know much about how the business side of things works outside my niche industry, or where to start when it comes to starting a company. I have no idea if any data product I develop would be potentially valuable to customers, and how I would market or distribute it. Any resources, links or ideas would be much appreciated. I apologize if this question sounds to vague or unspecific, unfortunately google isn't very helpful in this regard.