Using numerology, there are two important numbers worth knowing. The first is one's month + day +y+e+a+r of birth. The other is one's North Node number.
This book walks you step by step through how to obtain your astrological birth chart, and then how to determine your North Node number(s).
Please effective use of this book requires either some skill with astrology or access to someone with skill with astrology, and the chart on page 264 of the book Numerology and the Divine Triangle by Faith Javane and Dusty Bunker.