reflection to creating podcast

I created an account at Gcast and made my first podcast. It was incredibly easy. It is a little rough around the edges, I started recording and didn't stop and then I just uploaded the first version. Few questions I have, can someone link right to the podcast or do I have to have it embedded somewhere, can I add music to it after I have done my speaking part, and is there a way to break one podcast into separate recordings and then combine them all into one large recording? I really like this way of creating a podcast, but is there a way where a podcast can be created with just a microphone hooked up to the computer? I'm sure there is I just need to investigate other podcast sites. Any help/comments would be greatly appreciated!