Here is a diagram showing how the generic remote module is wired up for 110cc (and many other) chinese quads using the 5 pin AC powered CDI.

Some history: This style remote module design has been around for decades. It was used originally on motorcycles and has since been cross applied to these small chinese quads. The diagram above shows the complete set of remote start/kill/alarm module functions as it was orignally designed. They provided not only the ability to kill the engine remotely, but also allowed remote starting of the quad regardless of whether the ignition switch was on or off. And there was an alarm that drove a siren and flashed the turn signal indicators.
As these modules became more and more targeted to quads they started to drop features that aren't really all that applicable. These small quads don't have turn signals, so that feature was the first to go. The alarm is annoying, and if you think about it, the ability to remotely start up a quad even when the ignition switch is off is kind of scary. So these feature are often left out too. As these features got dropped the remote modules still used the same 9 pin wiring harness connector, but they just left the wires for the unused features off.
Here is a couple pictures for a simple remote kill switch module:


Note how it only uses 4 pins on the standard connector and three wires into the module. The other pins are empty. For your quad without a remote connector you would have to wire the module directly into the wiring harness, but that would require only three wires, so it would be fairly straightforward to do.
That fourth wire from the module that does not go to the connector is the receive antenna. It just dangles.
Here is a couple pictures for a more complex module:


Note that all the pins on the standard connector are wired up, so it supports all the functions - even flashing the turn signals when the alarm goes off - but since a typical chinese kid quad doesn't have turn signals there would just be no wire connections on the harness side of the connector. Once again this function is unused.
If you don't have a remote module connector in your wiring harness you'll have to manually wire the remote module into your harness using the above diagram. Note that to allow the remote to start up the quad with the ignition switch off you will have to cut the kill switch wire at the ignition switch and wire separate wires from the module to each side of the cut wire.
If the remote kill function is all you want then the first option is the easiest since it is only three wires to hook up: Fused 12 volt power, ground, and the kill switch connection.
One final consideration on remote modules. They are powered up all the time and drawing current from the battery. From what I've read, some draw a fair amount of current and can draw down your battery in just a few weeks. Others are maybe not so bad. Thus when you store your quad for more than a few days it is imperative that you keep your battery on a maintenance charger (which you should be doing anyway) to keep your battery from from being damaged by sitting around partially discharged.