First look for birth-, marriage-, death-certifications, and other dates of your parents, grandparents and greatgrandparents,
the older the certifications the better. Now in the most times you know the homeseat of your forefathers.
If you found a forefather in the chronik you can find his father over the datas you find for him then look fore his father and so on.The best way is
reading backwards. Official datas are listet after 1650. Before this date 1650 you have only list of taxes and other documents