Streaming virgin

I’d stay clear of the headphone outs and Bluetooth as neither of those options are going to sound very good.  Digital streaming from a quality device dedicated to the task has the potential to introduce you to some truly outstanding experiences far exceeding CD.  Get the Bluesound Node.  It’s easy to use, easy to setup, supports nearly everything you’ll want it to (including MQA) and won’t break the bank.  Right out of the box it sounds pretty good if not a little on the dark side and if you want to take the next step you can do a dedicated DA or feed its digital to your integrated (losing the MQA if you go that route).  It’s a great entry to hi res streaming and easy to sell if you decide to step up to something better.

The blusound node is a great start, but if $500 is too much for starters l would suggest the Dayton audio WBA31. It is around $50 at Parts Express. It has RCA and optical outputs. It supports Tidal, Spotify (paid subscription) and many others (not Qobuz) by wifi streaming.

@dagery
although not required, you might want to add Roon - a software which makes all you file sources look like one library, and allows you to do in depth queries like “which albums did this drummer play in”
https://roonlabs.com

I second the Node.  They just upgraded the DAC and you can compare it with the DAC in your amp.  I like the Bluetooth option for discovery but the Node has both Bluetooth and AirPlay, so even if Spotify and Bluesound don’t work with each other you can still stream to it for discovery

For $549 USD, the Bluesound Node packs a lot of features.  My connection preference:  ethernet cable to the Node, then USB or SPDIF to your amp.  It can be controlled from an IR remote, a desktop application, phone app, or its own box-top buttons.  Plus, it's a Roon-ready device.