That's a pretty tall order to get into details. There are several audio mixing / mastering courses online. Lots of articles and books about it. The following are general rules of thumb, specific audio sources and characteristics will make you work at it. There's no solid numbers to hit in reality. I see folks say "EQ voices to these numbers", but I can give you half a dozen voices I work with weekly those numbers won't work with. Take everything with a grain of salt.
Basically, EQ different audio sources so they don't compete for the same frequencies. Then they can all be loud enough and not be muddy.
Next, start with your main audio (dialog usually) and set it where it needs to be. Then mix in music, then sound effects. One at a time, and be careful, once you set a level, and add other audio sources to it, your overall level goes up. Audio is additive, more sources, the higher the overall level goes up.
And average your audio level peaks between -6 and -3 in general. Don't go much over -6 for TV broadcast (ask the station about LUFS levels). NEVER hit 0db on the audio meters.
Mix / master by audio meters first, fine tune by your ears, but never exceed proper audio levels on meters.
Finally, like all audio professionals do, take a copy to reveal different playback sources to test. Play through your TV, on your Computer's built-in speakers, car, boom box, etc.