How to install boot camp without Windows cd?
Are you missing the physical media and only have an ISO of the Windows CD or do you not even have that? An ISO and an 8GB thumb drive is all you really need. Just launch the Boot Camp app and follow the prompts.

Boot Camp is basically the glue that allows Windows to install on a Mac. And by glue I mean the installation utilities and drivers.

Using Boot Camp without Windows is kind of like using an oil filter without the car to plug it into: it has no function all by itself, it only works in concert with another part. In the case of the oil filter, it needs a car or other vehicle. In the Case of Boot Camp, it needs Windows.