Write A Script (Try to develop a template just like a story) I use Scrivener to write.

Record Podcast. I use Adobe Audition. Other popular editors include: GarageBand, Reaper, ProTools & Audacity

Edit Recording. Add in Intro/Outro Music and any sound effects. 

Export. Compile final mix and export as .mp3.

Tag it. I use ID3 EDITOR. This is the metadata of your .mp3 file. If you want to know what I’m talking about, open iTunes, right click on any song and select Get INFO. All that text and the artwork is controlled by ID3 Tags. Not very hard, but important.

Upload. Upload .mp3 to Libsyn as Download File Only