Before turning the gas back on, have the gas system checked by a professional. Follow the manufacturer's instructions and guidelines when using generators. Use a generator or other fuel-powered machines outside the home. CO fumes are odorless and can quickly overwhelm you indoors. Use the appropriate sized and type power cords to carry the electric load.
Overloaded cords can overheat and cause fires.
Never run cords under rugs or carpets where heat might build up or damage to a cord may go unnoticed.