Hi there, I would suggest reading up on web crawling/scraping and machine learning. These are broad terms, but i'm assuming you might not have coding experience , going into this.

Once you get familiar with these topics, you'll be able to crawl finviz' news page for example, and pull the text content of news articles. You can then parse the data and look for keywords such as: "bullish, beat, positive, increase etc." Vs "bearish, fail, down, deficit, loss etc" . This will allow you to assign a 'sentiment' to your articles. Finally you can write code to check the stock price and volume as you mentioned in your post. It's difficult to know if a certain PR has affected a Stock's performance, but using this method you can at least operate a bit faster than most humans. As it takes around 5-7 min to read an article. If you have no prior coding experience i suggest learning python. The syntax is fairly simple and there are multiple libraries that allow you to perform the tasks I talked about. One last thing, a library is readily available code logic that behaves a certain way.