I am probably not one to talk. But I am just starting to write and I feel that there are a couple of very important things for any story.
First, description, you need a lot of it but don't be repetitive.
Dialog, I like a lot of dialog but that might just be personal taste.
Write something that you want to write. Enjoy it. Imagine the world through your character's eyes and let things play out from there. Just write whatever you imagine they see, feel, ect...
Have a plot or at least somewhere you are taking the story. Every line should advance the plot somehow or at least be relevant.
That's my two cents.