Your bike does not need a sensor. The sensor is in the trainer. The trainer will communicate with your computer through bluetooth. You have to check whether your bike’s wheel and tyre sizes are compatible with this trainer. It may not be able to take a very fat tyre - these details are written somewhere in the product literature.
Once you load the bike on the trainer (please remember to lock it safely after loading) and the power is switched on, it will do everything else almost automatically. Basically, your bike’s rear wheel will be on a roller which will roll as you pedal and send the message to the trainer which in turn will send the message to Zwift. Similarly Zwift will send the message to the trainer and will control the resistance on the roller making your ride difficult or easy, depending on your route.
If you are buying it from a store, I am sure they will show it to you. Setting it up might be a little complicated if you are not too confident with gadgets. But if I can do it, I am sure you can also do it.
In short if you have a computer, Zwift software, this trainer and a compatible cycle that can fit you are ready to go.