Going to try digital

Simaudio Moon 280d
everything you need. 
https://simaudio.com/en/product/280d-streaming-dac

Digital opens the door to very many options down the road yet I think you are better off starting simple and once you get your toes wet you decide which way to progress.
As expressed above you need a source of music, a player, and a DAC.
Source of music could be ripped CDs, a music service such as Tidal which I believe is only available through computers.
The player will be a computer of some type: Android phone, Apple phone or device, windows PC, branded streamer box. A PC or Apple computer gives more flexibility at the cost of requiring more of your involvement. 
The DAC is the simplest decission: like any other hifi component.

I would go step by step. For example: buy a good DAC (spend $2k in a used unit?), and start with a laptop you have. If the laptop is too troublesome, switch to a streamer. If trouble is acceptable, look into a PC designed for audio which will sound a lot better than laptop.

FWIW I also started with an mc275 and in my case a Lamm LL2D pre when ventured into digital. Today my system is built around only having a specialized computer as source, it's a 3-way active system where my mc275 is dedicated to midrange and treble. No going back for me.

Hello lewinkih01 your response  is on track with my thinking .are you bi amping your system if so what are using for the low end drivers thanks.could you recommend a dac thanks scooter 

I just use blue sound 2i, $499.00. Works great. We use tidal for 20 per month. I use my andriod galaxy 6 to control it. My other half uses her iPhone 7.  It's quite simple to use and has a really good dac or u can use your on dac.  If u want to rip CDs or what ever you can get the blue vault. I think that's about 1k. Not positive on that price but I think I'm close. U can also use your I pad with it.  And with tidal we use it in are vehicles thru blue tooth. 
Pete

Left a something out. You can also pay 10 a month for tidal,  the 20 per month is for hifi people.  The music is also completely unlimited.  I have found every recording that I have looked up. I've been using it for 2 months. Strictly with our phones as controllers. It does have wifi, but I hooked it strait thru with a cat 6 cable.