Listen to Some Sample Podcasts
Tips of Script Writing for Podcasts
The following is from http://www.voices.com (a site for voice-over training):
Script Writing Style - Talking to Your Audience
There are two voice-over styles for recording your podcast that you should keep in mind when writing your podcast script. These include polished and freestyle.
A polished, professional sounding podcast, is similar to what you might hear in a news cast or documentary. The script is written out and rehearsed prior to recording. Generally this podcast may have particular themes that are explored in sequential order, demanding more structure and precision.
Freestyle recordings are most similar to live radio shows or television interviews. Freestyle is an ad lib, fly-by-the-seat-of-your-pants recording style that can be unpredictable, engaging, and full of chemistry. This style may work best for podcasts with more than one host, highlighting their dialogue skills and spontaneity, or for individual podcasters that decide to record a verbal stream of consciousness, especially poets, announcers, and others that are recording impromptu or on location at a live event. When writing a freestyle script, you may only need to include your segment theme and some point-form details within each segment. This way, you can refer to your freestyle script while recording without feeling nailed down to a finalized script.
Yield best results by combining these two methods and developing your own unique podcasting style.