Since you can read piano music already, read through transcriptions. There are books of many jazz piano players.
Two good and progressive courses are the John Mehegan series
http://www.playjazz.com/PI005.html
and Mark Levine's stuff.
http://www.amazon.com/Jazz-Piano-Boo.../dp/0961470151
you can get the piano book and the theory book together at a reduced price.
Good list of piano players (and horn players) above this post.
and ear training. You must define what you hear.
Good luck.