I would look into LLC's based on what your describing. Maybe even an LLP. However I have a slight suspicion if your from a country that it is hard to set up the accounts you described you will likely expose yourself to a lot of liabilities and legal problems in your country. Also I think you will also cause a serious tax headache on your part.
Maybe look and see if there are companies in the US that provide a "corporate shell" and take care of taxes, etc and then pay you as a contractor... Only an idea. Not even sure if this could work or is even legal.