That part

definitely great advice with the headphones, learning the monitors, & room correction. Unfortunately actual room treatment is the most overlooked because nobody wants to invest in it. It doesn’t have to be crazy expensive tho.. If you’re even slightly handy with a drill & stapler

some 1x4 or 1x6 pine from the hardware store, rockwool safe n sound or Henry Denim insulation for my hippie homies, & fabric (burlap or anything that passes the breath test) from Joann’s can work wonders. Room treatment will bring the listening environment to life instead of a convoluted canceled out mess. Better off with just headphones at that point. Nice headphones btw! The 600s are solid. Do you find them to have a very flat response like beyerdynamics? I was at Sweetwater checking out the hd800s they’re definitely on my list. Have a pair of dt770s I’ve used for like 15 years now. I trust them for sure.
Budget monitoring list: Yamaha HS, KrK Rokits, or IK Micro monitors would suffice as previously mentioned by others. Beyerdynamics for headphones & you’re off to the races.
Step up would be Adams, or Focals.
If you ever get bit by the bug….. Sennheiser HD800s, & ATC monitors. I rock the ATC SCM45A. ATC’s shine a microscope on the midrange & just let you hear everyyyyyything. In the best way possible. Truly an experience.
Anyways good luck on your venture
@Charvel1975 