What do I need to start Streaming Music thru my Audio System

Im an Old Man that needs help! I would like to try Streaming Music thru my stereo but have no idea how to do it. I have a Lap Top Computer. My system is as follows: Emotiva XSP 1 Pre Amp, Genesis Digital Lens, Wadia 321 DAC, Audiolab 6000 Transport, Bel Canto REF 1000 Amps, Thiel CS 6 speakers.  Any help would be greatly appreciated!!!