Well, the least helpful advice (but still the best) I can offer is to write more. That’s really the only way to get better at all. Still, you probably were looking for something more detailed, but I can’t offer much else with what you’ve given me.
The second best advice I can offer is to read with awareness. Find stories you like and figure out why you like them, and the same for the stories you dislike. Then, try to copy those elements you enjoy and improve/avoid the aspects you don’t. Then, steal the techniques and make them you own.
I could give you more personal advice if you told me a bit more about what you want to write, or send me a link to what you have written already.
Bracken's Corner 