Submission is easy, contests are overrated, have not contacted any "publishers" on the site so I cannot say if they are credible or not. It's a fun site for writers, poets, and playwrights who want their work to be critiqued by others.
Creating a set is easy but gaining notice on the site is not. I recommend joining groups and entering their contests to move up on this site. Have not won any prizes so I can't attest to that.