So many writing books out there and so few actually live up to their promise or your expectations. If you only buy one book on writing, then let it be this one. Sure, you don't only need one book; you probably need 'A Writer's Coach' by Jack Hart too.
Roy Peter Clark is a literary genius and his '50 essential strategies' are worth their weight in plutonium. Read it three times: once, straight through. Once more, one tool per day. And one last time, over the course of the rest of your life.