I have a murray lawn tractor that I am going to put a 12hp briggs on it but the key switch is missing I want to put a toggle switch and push button start on it but I don't know how to hook the switches up I need help please thanks kenny

Installing a toggle switch and push button start on a 12hp briggs motor

I have a murray riding mower that I got it is missing the key switch I wnt to install a toggle switch and push button start the motor is a 12hp briggs I need help on how to do this thanks