Hi,
I'm in the same situation as you. I was about to ask exactly the same questions before i saw this message board.
I find it all a bit daunting having just given up on an advertising copywriting career to write my own stuff. I've just posted my first story on here as well - which was a bit scary in itself actually.
Good luck finding an agent/publisher for your work, and if you come across a good one, let me know. I'm just about to start working my way down a long list of my own...
As they all say, don't give up. One day people will pay millions for transcripts of message boards like these. It'll be the first printed evidence of 'those great writers before they were famous'