That's a pretty ambiguous question. Like asking how to be a better surgeon or pilot.
So let's start with this: Post up some of your images and why you think they're not good.
I'm not sure whats going on with your pictures. Other then I think they are grainy/blurry because you are using the digital zoom feature on your camera
I agree, looks like it's adding more noise to the picture, the more zoom you use.