High School Classics Podcast -- 2

I'm a high school student that needs some basic technical help setting up and launching a Podcast series on the Classics. I've already recorded my first interview through Zoom. Now, I just need to edit it through Garageband and upload it onto a Podcast platform(Apple, Spotify). I also need to choose the creative for the podcast tab and get it out to the world. Looking for a resource that can help me get all this done.