If you know where the judgment debtor works you need to prepare a writ of execution, a memorandum of garnishee, a memorandum of costs post trial, and levying instructions. You submit the memorandum of costs and the writ of execution to the court clerk for filing and return.You then provide the civil division of the county sheriff copies of the documents and pay a fee. The sheriff then does the wage ganrishment.I suggest that you may want to contact your local legal aid clinic for assistance in that debt collection is hard work.