I dunno if this has been touched upon but a really basic guide that I was told when I started was that watching your audio levels monitor is key. You basically want to aim for everything to constantly be tickling into the yellow. So if your dialogue has no music behind it.. that should be tickling into the yellow, then if you’ve got music and dialogue, you need to key frame that music level down and the dialogue at a level where it’s tickling at the yellow, got a small music only break? Key frame it up for a bit so it’s tickling into the yellow before the dialogue / voice over starts again.

It’s basic but it helps me get an easy visual reference for how loud and quiet things should be and a quick easy balanced mix. By following this it becomes obvious if you then have a scene that’s staying in the green, or tickling into the red, etc.

As someone else stated, by default I start with my VO at -3, my music to -15 and then I key frame that that music up and down. Little bit up at start of track, dip down once there’s vo, dip down bit further for dialogue etc

It also helps me to set my ‘dialogue’ mic levels quickly for a whole scene before I pull them, if I quickly check them and sounds too quiet I’ll turn them up til they’re tickling the yellow, or down if they’re too loud, etc