Check your local library for writing books as well.
I really like Noah Lukeman's writing books. He's primarily an agent for literary writers but a lot of what he says can be applied to other genres as well.
The First Five Pages, The Plot Thickens, and A Dash of Style
A Dash of Style is pretty intense punctuation and grammar and might be a bit much for a beginner with weak writing structure, but for someone with a good grasp of the basics it can be very helpful in expanding your writing style.
The Plot Thickens is more about characters and how they affect the plot than about the storyline itself. The First Five Pages is about making your opening shine but what it teaches can be carried throughout the book to improve your overall writing.
Tina