Tyrus, while I am certainly not an astrologist, I would think that the non-predictive use of astrology would lie in researching your birth chart to see what you are "hard-wired" for in terms of the gifts and personality traits you were born with. Understanding these things can help you make the best use of your gifts and sometimes help you make peace with certain aspects of who you are. Similarly, an appreciation of what is happening astrologically each day, can help you make better use of the energy personally, and possibly shed some light on why things are proceeding as they are.
I don't know why you couldn't start with this subject. If this where your interest lies, go for it.