I'd say go through the manual and try each of the features.
It's important that your camera is very familiar to you, because you don't want to lose a great shot because your fumbling around due to a lack of familiarity.
After that, it's really about general photography skills.
The best way to improve your skills is study someone's photographs who's style you truly admire and try to figure out what they are doing.
I've copied the style of one of my favorite photographers and it improved my photos 300 percent within about the first 100 shots.