In-Depth Google Analytics Report

Looking to track existing websites with extensive Google Analytics reports that can help show which advertisers led to sold inventory so i am looking to begin a company that is a third-party analytics company. What we would do is set up tracking on company websites measuring page performance by advertiser on specific pages. From there, we would export the analytics to create a report/dashboard displaying performance. We want to measure referral sources like Facebook, Display, Paid Serch, etc. Lastly, we would pair with a company's inventory feed to see which products sold that month and then cross-referrence with the analytics to see which advertisers led to the most quality page visits on the products sold the primary function of this person would be to be able to provide the code to implement on customer websites and have the ability to then export that data into a report based on the key metrics we determine