How to setup music server to mid monos

Forgive my ignorance. I’ve read a ton on this topic and just seem to get more confused. 
 

I would like to use my computer as a music server to play digital files to my mid monos. I have full house cat5e.  I would like to be able to control the music server from my phone as the computer is in a different room. Blue tooth likely wouldn’t work due to distance. So control via the network. 

the digital files will be a mix of high quality studio and lower quality live recordings  

I have the following:

counterpoint pre amp

mid monos 

heresy Iv (purchasing soon)

outside speakers (some all weather JbL) 

what extra component and software do I need? A standalone DAC?

my budget for a component would be $1000 or less. If I need a DAC, I understand that for high quality I likely need to spend significantly more  if I like the setup, I may upgrade in future. So for now, good enough is good enough  😊 

thanks for the help!