(a) A proceeding under this article may be commenced:
(1) In the county in which a child legally resides; or
(2) In the county in which a child is present when the proceeding is commenced if such child is present without his or her parent, guardian, or legal custodian or the acts underlying the dependency allegation are alleged to have occurred in that county.
(b) For the convenience of the parties, the court may transfer the proceeding to the county in which a child legally resides. If the proceeding is transferred, certified copies of all legal and social documents and records pertaining to the proceeding on file with the clerk of court shall accompany the transfer.