Software: as Bert says, you need good software to rip (copy) the CDs. Make sure you rip in a lossless format. I use dbpoweramp. You also need decent software to control playing the music - itunes will work but there are better. If as Bert (rightly) recommends you store your music on a network drive/NAS then asset or minimserver are favoured by the forum.
Hardware: you need a decent DAC between your laptop and pre-amp. This could be a stand-alone (Naim has Dac-V1 or nDac; Chord make various Dacs - is a Mojo too much? How about an Audioquest Dragonfly to get you going?) or included in a digital player (Naim ND5 XS and up). Cheap' has a variety of possible meanings but you could start with the dragonfly and work upwards from there. Not sure about a cable from dragonfly to Nac72 - others here may be able to help.
Search the forum with the above in mind and you'll start to get some ideas.