unless there's something electronic in the electrical wires, it should be pretty simple.
do you have a multimeter? a cheap one from radio shack will do.
Try this. Locate the large terminal on the starter. Use a heavy gauge jumper cable and go from the battery positive to the large terminal.
Does the bendix pull in and spin the engine?
If it does then you're ok to this point.
Now trace the heavy wire back to the starter solenoid. Probably mounted somewhere on the frame where you can't see it.
One terminal goes to the battery, the other goes to the large stud on the starter. The smaller terminal is the solenoid coil. go with the jumper from the battery to this smaller terminal. The coil should give a loud click and the starter should attempt to spin. Use a piece of heavy wire and find a clean place on your frame and attach one end here. The other end of the wire, connect to the ground of the solenoid. Now try from batt to small terminal. if the engine spins, your problem might be a bad ground between the solenoid bracket and machine frame.
clean off the attachment point and re-bolt up the solenoid.
Let me know what happened.