Stick it on the camera and shoot everything with it until you get used to it. You'll quickly discover what uses it fits for you. I got mine for portraits and as my "main" lens, but have quickly found out that certain pictures inside are difficult with this focal length. Taking a picture of more than one person indoors gets tough for me (which is why I'll probably pick up a 18-55 kit lens as a "just-in-case".
