It has been a long time since I graduated from the bluesound node to a standalone streamer and DAC.
I remember there were a few things that tripped me up.
First don't try to do it wireless. Plug it into the internet. then you know you have internet. If you want to go wireless, you can do that aferyou get it working (but wired is better sound).
Second, use the RCA outputs to your pre-in on your amp or to an input on your preamp.
If you have a seperate DAC, you will want to use the optical output. Unfortunately, the USB port on the back is not an output but an input for firmware changes, IIRC.
Good luck. Streaming is the way to go. I just upgraded to my 3rd post Bluesound streamer with a pricetag an order of magnitude higher. and your DAC will become the heart of your system and you'll want the best one you can afford.
Jerry