Although I don't practice in the Tibetan Buddhist tradition, I have friends who have undertaken ngondro practice and I have followed their development in this tradition. My understanding is that ngondro is always undertaken under the guidance of a teacher. If you don't currently have a Tibetan Buddhist teacher, you might postpone ngondro training until you establish such a relationship by taking refuge.
Wikipedia has a good description of basic ngondro practice, and of the variations.
You don't need a home in which to do ngondro, although you will need some place to do formal practice, including the prostrations. Your teacher may ask you to purchase items such as a mala, used in counting repetitions.
Perhaps one of the folks who practices in the Tibetan tradition can offer more information. Best wishes in your training.