A proceeding under this part may be commenced:
(1) By transfer of a case from another court as provided in § 37-1-109;
(2) As provided in § 37-1-146 in a proceeding charging the violation of a traffic offense;
(3) By the court accepting jurisdiction as provided in § 37-1-142 or accepting supervision of a child as provided in § 37-1-144; or
(4) In other cases by the filing of a petition as provided in this part or by issuing a citation as authorized by law. The petition and all other documents in the proceeding, other than a citation, shall be entitled “In the matter of _____, a child under eighteen (18) years of age.”