One thing that podcasters are beginning to learn from the book industry are launch teams!

Launch teams are a core group of fans, friends, family, etc., that will assist in the launching of your book/podcast. They will write honest reviews on your launch day, and assist in promoting by sharing. In return, they typically receive the book in advance to read, plus any additional incentives for those you’ve selected to participate.

For it to work in the podcast world, it may be better if you have a non-topical podcast where you already have a few episodes to launch with that your team can listen to in advance, if not, your communication with the team will be vital so they know when your launch occurs, and are already subscribed and are just waiting for a listen to write your review and promote!