Kundalini Yoga is very different from hatha and other related types of yoga. This yoga, as taught by Jiwan Shakti, is based on the teachings of Yogi Bhajan, and his instructions to his students were to not change the teachings, but to pass them on exactly as they were given to us. His teachings are being carried forward into the Aquarian Age by his students and by the organization he created, 3HO.
Where hatha and its many variations are based around sets of asanas (poses) with some pranayama (breathwork), Kundalini Yoga sets are composed of kriyas (literally, “cleansing actions”) which typically combine dynamic movements, pranayama, mantra (inner and outer sounds), and mudras (hand positions). These sets of kriyas usually focus on a specific purpose, like energizing your overall body systems or revitalizing and balancing your glandular system.
The meditations also focus on specific areas of your inner life. Some are intended to clear the main flywheels of your energetic system, the chakras, some more subtly help you work on larger life issues like your fate, karma, destiny, and dharma (spiritual purpose, soul purpose in this world).
You can take it as far or as lightly as you want, but once you start on the path you will find yourself being drawn along by forces larger than yourself toward you ultimate destination. Only you will know what that is to be.