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Prepare your content. Record the audio for your podcast. Save the audio file to your computer desktop. Tag it, give it ID information (artist, album, etc. Create your RSS podcast feed.
You may want to put together scripts for what you will say at the beginning of a show and when you transition from one story to another. Put your content in order so you can read down the list. Whatever it is, make sure you enjoy it. You probably won't become rich from this endeavor. Spend your time discussing or promoting something you really care about; the reward will be in feeding your knowledge/humor/music to others. This is probably the biggest step for without your voice, your podcast doesn't exist. Talk in a consistent pace and show passion in your subjects. Read the scripts and don't forget to thank people for being part of the show. You can have the perfect podcast delivered, but sometimes technical glitches run the show, ruining all your hard work. Before you begin the actual recording session, take a few samples to test the software, mess with the volume controls, and just plain make sure everything is functioning. Make sure it's in MP3 format; a bit rate of 128 kbps is probably sufficient for a talk-show podcast, but podcasts featuring music will want bit rates of 192 kbps or better.  Do not use special characters (such as # or % or ?) in the file name. Open it up into your sound editor and edit out extra background noise or long periods of silence. Put in intro/outro music if you'd like. Of course, you can always save it as a WAV file first, to give you a master backup to work from if something were to go wrong. ) and give it album art. Either make it yourself, find some free, non-copyrighted images online, or have a friend make one for you. Be careful to name the audio file so that the name of the podcast and the date of the episode are clear. You may also want to edit the ID3 tags of the MP3 file to help people find and catalogue your podcasts. The feed must meet all industry standards for a valid 2.0 feed with enclosures. Try using a complete solution and service such as Libsyn, Castmate or Podomatic (see the external links below). For longer podcasts, you'll be paying a small fee.  The easiest way to do it is to use a blog. So hop on over to Blogger.com, Wordpress.com, or another blogging service, and start a blog with the title of your podcast. Don't make any posts just yet. If your host has limits on the amount of bandwidth you can use, you could incur overage charges if your podcast becomes very popular (fingers crossed!).  A feed acts like a "container" for the MP3 file that tells feed aggregator programs where to get new episodes. It can be done manually with some XML coding. It's similar to HTML. You can copy another RSS file and use the template to make your necessary modifications.