Start by heading to chesscafe.com and checking out Dan Heisman's Novice Nook column. He's a great writer for helping low-intermediate level players improve. His monthly column has run for 100 months now, and all of the articles are available in the archives section. A generic study plan, including book recommendations, was among the earlier articles, so start with that, then read the rest of his articles along with some of the books he recommends.
--Fromper