Most compressors have the same parameters, and some have extra bells and whistles. For a talking, PLEASE don't make it sound like the quintessential (sp?) JAM radio guys where it is compressed so much that you hear the smacking of their lips and every breath they take. Here's some basic ideas:
The three things (in this order) that you want to start with are EQ, Compression, and then maximize your volume with a Limiter.
EQ - First thing to do is filter out the lows, you can use a paragraphic (or similar) EQ for this. When you open the EQ, its should have "bells" that you can pull up or down. Pull the left one down to where you cut out everything at least below 100-150kHz.
Compression - Again, these parameters are all the same. We'll take it easy. First, set your ratio to about 4:1, attack to 0ms, release to 100ms, and then dial your threshold until you see your gain reduction move. Stop when the gain reduction starts hitting -6dB. Then set your gain makeup to about 5-6dB. This is TOTALLY basic and compression is always circumstantial (sp?); presets are just a starting point.
Limiter - This will maximize your volume to compete with other podcasts. Set your ceiling to 0db and then move your threshold until you see your gain reduction moving. Go to the quietest part of the file and make sure the meter is just about hitting the threshold at the quietest part.
Again, this is SO BASIC. You have to play around and see what works and sounds best to you. Get to know the jargon, ie threshold, gain reduction, ratio, dB, kHz, etc. It will help you big time!
Export to MP3 192kps. Any less will sound washy, and anymore just makes the file bigger.