I've posted a reply talking about practice and mentioned this book:
I have bought a book that seems to be the ultimate one in piano Jazz and music.
Metaphors for Musicians - Randy Halberstadt. I bougt it last year, around Christmas. I've almost gone through it! It's so interesting and well written that you want to devour it all day long. It has great tech for you to enhance your right and left hands' playing. It's got it all: Practice tips, scale fingerings, the coolest ideas for piano playing, voicings for differente environments (solo, duo, trio, quartet), tips for professional musicians (there a really helpful) about behavior and the act, there's a bunch of theory made easy, all the works! Randy is a genious, man! He teaches like Jesus: Using metaphors. Very didatic.
Go for it!