You'll need a podcast host to make sure when you publish your episodes your subscribers automatically download your show.
Libsyn.com is my favorite podcast host.
You can get hosting for as little as $5 a month (one cup of Starbucks), it has built in "one click" publishing to directories like Google Play, iHeart Radio, and Spotify, and offers detailed analytics to help measure your shows growth and which episodes are most popular.
If you are looking for the best podcast host look no further!