Talking on the radio?

[fenway]

Hello,

I am new so was hoping someone might be able to help me out. I am currently running a test shoutcast server from a host until I can make sure sure I am able to dj properly. I am trying to be able to talk on the radio with the music in the background is this even possible? I currently am using my laptop with it's built in mic. Do I need to purchase a headset with a mic in order to have background music? Having to switch from winamp to sound card completely turns off the music and makes for a poor showing in my opinion. I appreciate any help that anyone can give. I would also like to know if it is possible to have members of my site call in to the radio for I would also like to run a talk show.