There are 3 key things you need to launch a podcast. Here are the 3 key things you need in order for the podcast directories to approve your new podcast.
1) Audio File - You will need at least 1 audio file in your hosting account and RSS feed. We recommend creating a trailer episode for your show to complete this step.
2) Podcast Artwork - You can see the specs for artwork here.
3) Basic information in your RSS feed - Title, Description, Category. You can set all this up in your podcast hosting account.