the key has 3 positions and 4 wires running to it.
off
on
start
there is a hot wire and a ground, you won't have to worry about the ground
the other wires go to the "on" position and "start"
simply wrap the "on" wire to the "run" wire, and touch the "start" wire until the engine starts.
there, that is the basics. you will need to learn to use a DVOM and have a basic understanding of the wiring of the cart to distinguish which wire is which. cars usually use a 9-wire system, modern cars have an encryption chip in the key, much more complicated to steal