You must first demand the rent from your tenant and warn him that you will start a case in Housing Court if it’s not paid. After you demand the rent, if the tenant still does not pay, you can file a notice of petition and petition in Housing Court to start the case against your tenant. You will have to purchase an index number from the clerk’s office. This costs $45 and can be paid with cash, money order, or certified check. If you are low income you can request a fee waiver. Then, you will have to serve the papers on your tenant.