Great list of digital literary magazines and online journals with brief reviews by Gina Vaynshteyn published back in August of 2014 on Bustle. The list includes well-known lit mags as well as some lesser known markets, like Muzzle, decomP, and Little Fiction and Big Truths, a creative nonfiction journal.
Check them out, read past issues, and then send off your best work that meets their submission guidelines. The really nice thing about submitting to lit mags that make lists like these, is that you know they have a decent readership. Your poems won’t just be sitting on some web page out in cyberspace, collecting dust.