Unless provided otherwise by the Council, the Administrator shall act as the purchasing agent and contracting officer for the municipality with authority to award and execute contracts as provided by Council. Unless Council provides otherwise, contracting procedures shall be in accordance with the general laws of the State of Ohio. Council may establish contracting procedures which may provide for, but not be limited to, which contracts must be let by competitive bidding, the amount of advertising required, which bidding may be rejected, and alterations and modifications in the contract.