when burning podcasts to a CD do you select AUDIO or MP3 when durning

That one would be a matter of personal preference... it just depends on how much of a gap you want between the end of one track and the beginning of the next. Other than that, it has no effect on the end product.

Audio would act like a CD you purchased at a store, you pop it in and it starts to play.

MP3 is more like a data CD. It can be read and played in computers, as well as any car stereo/home CD player that can play MP3. These days, that would be most of them.

It just depends on what you plan on listening to the CD with.

Lower speed is acknowledged as equaling better quality... so take that for what its worth.

Also to add to what I said before... you can get a lot more on a data CD (mp3) than you can on an audio CD.

Will iTunes automatically convert to my apple one

Yes.

If you don't know... stick with Audio disc. It will play in any player.