Now, the next step is get some good books. If you ask me, I'd say start with Anthony Louis' "Horary Astrology Plain and Simple" - it's beginner level.
Then read Lee Lehman - "Martial Art of Horary Astrology" - the intermediate level, this book will set straight the main issues in horary. Then, read John Frawley's Textbook of Horary Astrology, also intermediate level to advanced; Sometimes John comes up with revolutionary ideas, that differ to the common approach to horary. You'll be then able to decide for yourself if it's better to follow his ideas or to stick to tradition.