Mixing vocals tend to be a handful sometimes especially if you are trying to explain the entire process to someone who is new in the industry and there are so many possibilities. There is no exact one way to do the process simply because each part has its own dynamics like the voice. Here is a guide that you can use to begin mixing vocals.
Establish your concept, although the actual process of treating vocals can be quite simple, tools such as equalization and compression can be used to adjust tones and control the entire dynamics of your mix.
Read more here: https://theproaudiofiles.com/mixing-vocals/