I am a beginner in openCV. I want to detect some images, do I need to generate cascade file similar to one present in face detection sample app? What is the correct way?

I have installed opencv-3.0.0 using the installer from "http://downloads.sourceforge.net/opencvlibrary/opencv-3.0.0.exe". I am running the utilities opencv_createsamples and opencv_traincascade directly after running the installer. Is this the correct way to run the utilities?