Create a blog that supports podcasting. You only need to do this if you are not creating your own RSS file. The blog can create it for you.  All faculty and students have free blog accounts already, courtesy of the fine folks at Academic Computing. You can set yours up by logging in to blog.usf.edu. Something to keep in mind is that the USF blog is a public blog.  Every time you post something to your USF blog, it is also posted to Planet USF, a page that has the latest postings to all USF blogs.  The USF blog also only supports .mp3 attachments for podcasts.  While this is not a problem if you are doing an audio only podcast, it means you cannot do an enhanced podcast, which must be saved as an .aac.  There are many other free blog sites available on the Internet.  A popular one is Blogger, which is owned by the search company Google.   Whatever blog you use, make sure that it supports audio attachments.
step 3: create...
Podcasting 101