Determine that you actually want to become an astrologer. It is important to understand that becoming a professional astrologer can require study in many subjects including, history, philosophy and science.
Decide if you wish to do your study on campus or online. Check the Kepler College website for information on their curriculum. Their website also has a links page that lists additional accredited colleges that offer study in astrology.
Investigate your online study options carefully. The Institute of Professional Astrology offers a one year training course in astrology that does not include the humanities courses. If you already have a college degree, this may be a better option.
Invest in a few books on astrology to get caught up to speed on the latest in the field.