Our small sole proprietor ship performed labor on a powerplant. The owner slowly fell behind so we had to pay our laborers. We sent her the bill twice via the plant manager and his email. It is about $16,000. What should we do? Send certified letter for Prompt Payment demand with intention to place lien in 90 days? What form must I complete for the lien or court case.? Superior Court? Does she have to be served by a sheriff? Thank You!!