Hi Betnoxi Charles. Firstly, a big warm welcome to the site. The forum is not the best place to advertise your story/poem.
Just write it and then post it.
The best advice I can give you is this. Read other peoples work as much as you can and comment on it. They will in return read yours and give feedback. That's the way it works.
Once again, welcome.
Welcome from me too betnoxi. I second jolono's advice. If you read and comment on other members stuff I guaranteed most of them will reciprocate. Just go for it and enjoy the site.
...to add to that, if you want full critique of anything, the site has the option to pay a reasonable sum for a professional critique. But, yes, posting constructively on other people's work should get you some feedback of your own. Try the 'search' option to find work that interests you.
Parson Thru