Stream live audio/music as well as video: Need help in choosing the suitable solution

Hi, I am new in the streaming industry but a developer by profession. I have started a new entertainment site and would like to stream live audio/music as well as videos (this at a later stage). I am not so sure of the resources that i should get and more especially the streaming software and how it works. However i am looking for something less expensive that will get me started. Please steer me in the right direction. Your help is highly appreciated.