If you are not completely familiar with the basic exposure principles, I would suggest you work on that. Either with a basic photography book or just read online or ask here. Either way, get completely familiar and comfortable with the relationship of shutter, aperture, and iso first. Once you have that, the owner's manual will make more sense as well as whichever d3300 book you end up with. They tend to gloss over the very basic principles which can leave you a little frustrated. Your camera is a high tech tool to help you implement those age old film principles, so understanding the basics helps you get the most out of the camera specific books.