Data collection and organization, LinkedIn searching

I would like to create a set of data based upon a list of ~100 companies. Most of the data has been copied from a website (see Data tab on excel file) and all of the company website addresses can be found on that same website. I would like links added for each company's LinkedIn page, and the estimated employee count from those company LinkedIn pages. It might take a little googling to find the right LinkedIn page, and not every company will have a LinkedIn page.