1) Build a MVP prototype with the scraped data. Don't worry about the business model. Yet VERY IMPORTANT make sure you are allowed to scrape the data in the first place. Work out an agreement that you are interested in the data but don't give away your methods.
2) Pitch the idea FIRST AND ONLY to the data owners. Suggest to them the usefulness of their data. They may want to invest in YOU to build it out. If the data owners are hard to approach then reach out to mentors that have networks connections.
3) Fall back and last resort is to build up your own data. This will be tough and tricky. You might have to build your own search engine (or similar type data feeding app). You at least own the data.
As conculsion, content ownership is king in the online media world. Make sure you follow the appropriate channels. Talk to the data owners about interest in their data. Get aggreements in place for access without giving away proprietary methods.