(a) The Selectboard may provide penalties for the breach of any ordinance authorized by general law or this Charter; may prosecute any person violating the same through the Town Agent, constables, or police officers who for such purposes shall be informing officers; and may maintain actions to restrain actual or threatened violations of the same. The establishment of any fine or penalty shall be by ordinance.

(b) Ordinance-making authority granted to the Town by this charter and general law shall be exercised pursuant to the provisions of sections 302 through 305 of this charter.