On affidavit of the commission of any crime, of which the justice court has jurisdiction, lodged with the justice court, the clerk shall, upon direction by a justice court judge of the county, issue a warrant for the arrest of the offender returnable forthwith or on a certain day to be named. The clerk, or the justice court judge to whom the case is assigned, shall issue subpoenas for witnesses as in civil cases, and the justice court judge may enter a conviction as provided in Section 99-19-3, or shall try and dispose of the case according to law; and, on conviction, shall order such punishment to be inflicted as the law provides; provided, however, that no fine imposed shall be in an amount less than Fifteen Dollars ($15.00).