setting up a Behringer MX 1602A and RME Babyface with SONAR

Looking for assistance on the best way to set up this mixer and audio card with my system:
 
WIN10 with Realtek audio card connected to a default set of computer speakers
RME Babyface (USB)
Hafler AMP
Mackie Hr824s
Yamaha NS10Ms
Behringer MX 1602A mixer
Kurzwe1l K2600XS and PC2X keyboards
SONAR Platinum
 
I intend on recording/mixing with the NS10Ms (and headphones plugged into the RME) and use the Mackie's for final mastering.  Can provide photo of mixer via email or Dropbox....
Thanks,
-Dave