A couple years ago, a poem of mine, my first published piece, was accepted by a now long dead literary project. I was 16, and absolutely stoked. The ezine was called the Railroad Poetry Project.
Where did your first published piece appear?
If you haven't been published yet, there are some awesome Facebook groups you can use (search "calls for submissions" at Facebook) you can use to find presses seeking submissions. I'd include links, but I'm currently making my first post.
Cheers!