Same way .. set up the encoder(s) and then start and play music.
Not sure I understand your question about the customized widget .. can you explain or expand what you need.
Okay after tedious research i've finally figured out how to stream my music from my server to my own website, i hope some members of this forum could create a sticky forum post on guide to start your own internet radio. First off i've learn that the encoders work as transmitter that will stream my mp3 to the listener. So for that to work i've found that there are free encoder service such as ShoutCast and IceCast to act as handler, for example:
Sam Broadcaster -> IceCast/Shoutcast -> Player Widget(lots of website with player generator) ->Website ->Listener.
Hope my experience will help others getting started their own internet radio