For podcasting, here's a nice overview on how to get you started: http://snapguide.com/guides/create-an-audio-podcast-on-the-c...

For Twitter, check out http://www.socialmediaexaminer.com/how-to-grow-a-twitter-fol...

In fact, keep an eye on the site Social Media Examiner. Dig through the site. I'm sure you'll agree it's a gold mine of good advice relating to using social media effectively.