The kill switch is likely going to go to a wire that connects to the magneto coil. There will be a little tab sticking off the coil that a spade connector should plug onto. The kill feature operates by grounding this connection. That stops the spark from operating. I'm not sure how the light generator works exactly. You should be able to safely find the kill lead by experimentation. Assuming that the engine starts now, I would experimentally connect one lead at a time to engine ground, and then attempt to start the engine. When it doesn't start, that should be the kill wire. Alternatively, you could remove the pull start shroud and find the wire that leads to the little tab on the coil that I was describing. That would be the kill wire.
As for the light generator, I'm assuming that there is another coil that the permanent magnet flys by that generates a voltage. Unless there is a diode and/or some kind of regulator in it, it's just going to generate an alternating current on one of the leads with respect to ground, or possibly be an entirely isolated from ground circuit on 2 wires, I don't know. Here is some information that may help you figure it out:
http://www.smallenginesuppliers.com/html/engine-specs/briggs/briggswiringexplanation.pdf
Obviously, I'm assuming that you have a Briggs and Stratton engine. If not, then the pdf file isn't likely to be of much help. Removing the shroud should make it easier to figure out. The ignition coil is usually outside the flywheel, I have no personal experience with where the lighting coil is mounted. It could be outside or underneath I suppose. Unfortunately, I have no engines here at my home that have lighting capabilities.
EDIT: I want to add that I wouldn't try the trial-and-error grounding thing with the engine running as you could "possibly" cause damage to the lighting circuit by grounding it. I don't know that for a fact, somebody else probably does and hopefully they'll chime in, but if it were me, I would only try it the way I said since you're not likely to generate enough current to hurt anything just by pulling the rope. I would have the plug wire disconnected and use a tester to see if it is generating spark so that the engine doesn't actually start when pulling the rope. IMO, your best bet is to remove the shroud and trace the wire to the coil to find the kill wire.
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