Getting started with Podcasting (new, need some advice)

Hey everyone, I am new to all this Podcasting stuff and have no idea where to start or what I need. Right now I have A microphone, my computer, and Garage Band. Iv heard so many things about needing audio interfaces, microphone filters, finally I just decided I would post and see what everyone has to say. As far as Audio interfaces go, I am in the middle of setting up a little in home production studio (I am a music producer) I also have a pair of speakers coming as they are part of my studio. If I need an Audio Interface, I would life to have one that I could have my microphone and the speakers all connected into one. If anyone has any sepcific audio interfaces that they use or know of if you could post the names would be a great help. Like I said I am new to a lot of this, still learning a lot and theres so many opinions and items out there I would just prefer to have some people with experience give me their straight up input. Thanks in advanced everyone, it means a lot to me!