Flat to vaulted ceiling

1978 home with conventional 2x4 framing, single story. Have removed flat ceiling in living/dining area to prep for vaulted ceiling framing. Living space spans 24 feet to outside bearing walls. E/W dimension is 26 feet. Client would like to keep entire space open to vault above if possible. Need specs/drawing for framing a ridge beam, sizing of rafters, where strapping is needed, sizing and location of collar ties and/or rafter ties (to be exposed if needed).