Data search in the Internet of provided websites

I am looking for a freelancer who would help me with a database creation. What has to be done: You have to check about 50 URL addresses (that I will give you) looking for the clients of those businesses. Then, you have to put the information about the clients into the Excel sheet. The information should contain: name, location, address, contact, type of business, industry, website, whose clients they are, so for each lead generated out from the websites (if possible, sometimes the client list is not provided), some additional research has to be done. The table has been started but some leads lack information so you would need to fullfil them. Every lead will be controlled. Milestone will be paid only after receiving partial leads, and only if they are correct. Good English is necessary. Please provide your price, milestone and timing. Competitive bidders will be contacted and presented more details.