Settings Volume instruments

Good morning,
Can someone advise me on the volume settings in Dorico 6 Pro? I also use the Studio Special Synchron. I also use Roland QUAD-CAPTURE and Yamaha speakers as audio phasers. I know roughly where the sliders are, but I find it difficult to adjust the volume of the instruments without compromising the balance. I don’t have a 100% musical sensibility; I’m just looking for guidelines to follow. I’m not a professional, but an enthusiast. Is it best to leave the mixer in the Vienna Instruments set to Classic, or Short Rev Nocorn?
Can anyone help this retired man? :slight_smile: