Read widely, reading fiction as a writer.rather than a reader. This means taking note of the way the author is setting the scene, building the tension and describing the characters. It is normal for a writer to feel daunted when reading a particularly good novel. It is also common for new writers to be derivative. Do not worry too much if you find yourself doing this, you will find your own voice, if you continue to practice.
Carry a notebook everywhere with you and write down ideas as they occur and snippets of interesting conversation. Set yourself tasks when you get home, such as turning a short burst of conversation into a story. Include description of people, moods and places into your narrative. Concentrate on showing the reader how a character is feeling rather than telling him, for instance writing about him tapping his foot, instead of telling the reader that he is nervous.
Use different senses when describing a scene in your novel. The sense of smell is powerful, instantly conjuring up a place, even a mood. Mention a song or background noise that emphasizes or recalls a particular period in a character's life. Avoid cliches such as dark and stormy nights. Use metaphors sparingly and carefully because they can really jar, if you do not get them right.