You have to check company names (you get a excel sheet) in seach engines and visit thier website (if available) or get the needed data somewhere else. you have to enter thier email adress and faxnumber into a excel-sheet. All companys are german, so in most cases you have a "impressum" a legal information about the companys. There you will find the needed data. It will be about 500 compays. Easy job to do. You get paid when work is done and checked.