Dear Ann,
Astrology is totally based on your birth details which include date, time and place of birth. Without these accurate parameters, astrology is useless.
If you have a specific question, and the above details are not available, you can make use of Horary astrology. Read my article on the subject on http://www.navagrahastro.blogspot.in and follow the procedures given therein to get an answer to a specific question.