Oh to find your personality card. Do your life path number calculation ala numerology
Say if your DOB adds up to a single digit base number, then your personality and soul cards will be the same which means they'll be a specialized/amplified emphasis on that card and it's themes in your life.
If your DOB adds up beyond 22 then simply reduce that to it's next reduced number value to get your card. Ie 1999= 10 Fortune personality card 1 Magus soul card.
As to what these cards represent....Well to simplify it and put it in an astrological context, the personality card is like your Sun, while the soul card is like your moon.