How to set up volume control on a DAC without a preamp

I would buy a great preamp first , it’s crucial to the overall tone/ sound of your system.  It does the switching and drives your amp.  I think a lot of times the Amp gets a higher priority than the preamp and to me that’s backwards.  
 

Then get a good Streamer /DAC  or even better a decent streamer and excellent DAC.   
 

Go to Schiit audio for $280 you can get a remote controlled resistive ladder relay controlled preamp  shocking but true and for the $$ a good product 

the Freya only $899 if you want a tube preamp .

these are budget and solid warranty.

A digital preamp,or passive you loose detail,and especially dynamic control and separation vs a decent Active preamp .

you never stated your budget for dac ,or preamp  for $600 the Denafrips Enyo R2R 15  gen 15 dac, or the New Denafrips Gen -15 Ares for around $1k very good build and sound quality,   Schiit Audio has several choices the lowest to go the $289  model , if you pay a little more monies  in your preamp you get more power supplies and bigger transformers much better sounding.

If you get a very good DAC with a quality digitally controlled, analog volume control/preamp you do not need a preamp. Connect the DAC to your amp(s)

That's how I'm doing it with my Playback Designs DAC. I'll have a phono preamp but my DAC will have analog inputs so no preamp necessary. Preamps may go away one day.

You haven't mentioned any of the contenders (dacs) or streamer(s)..

With that said, it's hard to give any kind of recommendation 😕