Hi this is the subforum for discussing the Ins and Outs, the Dos and Don'ts, or the Best and Worst of Publishing and trying to get published or to publish.
I have been a self publisher and small press since 2001. My website is www.rainflowers.org
I'll tell you here a little bit about what I know.
It's usually simple things that we should be educated on or need to proofread in our poetry or short stories that can help enormously in whether a piece is accepted or not, but first you have to find a publisher that is looking for the work you created, or else create a piece with that publisher in mind.
Some of our current guidelines for my own press are at
http://www.rainflowers.org/preferences.htmland
http://www.rainflowers.org/reviews.htmland
http://rainflowers.org/August312006meeting.htmland most of this gets better the more you write, the more you practice, the more you edit and try new things.
It's a lot of hard work, and at times it's fun but not all the time.
If you want to get published you have to learn from your mistakes, and you have to accept rejection well and keep going.
Some successful writer that I can't remember who had their house wallpapered in rejection letters.
Good luck!