I don't have a book suggestion and I'm just starting to get more serious about quilting, too, but I have to say that hanging around on this board is the BEST thing I've done. The perspective you get here is so much different - a lot of those amazing, "unattainable" quilts you see in magazines were made by people right here in this forum! The advice you'll get here is incredible, and it seems there is an expert here for everything.
Welcome, and good luck!