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Really depends on what parts you already have and what ones you lack. If you have the switch in the steering wheel, that is half the battle. I am sending you a page from the 55 service manual. If you look at the top right picture of the relay, it will pretty much explain itself. One wire to the battery, one to the horn and one to the switch in the steering wheel that works as a ground for the circuit. You push the horn button, that ground the relay and put power to the horn. The horn was mounted on the radiator tie bar from the factory. Thanks
1955 Chevrolet Truck Shop Manual 2nd Series