Basically, I will tell you the criteria for websites that you need to find.
I will also tell you how to enter data into an Excel sheet.
For example, I might tell you to enter all data grouped under columns like:
Company Information - Website - Industry - Contact Info - Description -
Just find 50 of them for starters and fill up the Excel sheet.
Feel free to bid.
Also, type "Excel" at the beginning of the application so that I know that you've read the requirements.