You're going to love this! When I first started out on this piano journey of mine, I scoured local bookstores, music stores, and libraries for information that would allow me to express myself freely at the piano.
Well, one of the first things I came across was something by Jamey Aebersold. Aebersold is a "jazz" man. But don't let that stop you from learning from him.
You see, Jamey brilliantly put down in one slim volume almost everything a modern piano player needs to get started in terms of theory. His scale syllabus is really something special and explains the modes, and scales in a way that you'll really appreciate.
And here's the best news of all. He's giving away his entire groundbreaking book for free! I couldn't believe it myself. But it's true nonetheless.
to go to his download page where you'll see the book arranged by chapters. I highly suggest you take a look at ALL this material for it's extremely useful!
Play New Age Piano http://www.newagepianolessons.com