The primary way I learned how to mix was watching professionals as an system tech for a large production company.  I spent countless shows standing next to Audio Engineers from some of the biggest acts in the US.  In the down time, I would ask them as many questions I could.  Then I would apply what I learned the next time I was at the console.

Here is a video of the process that I go through when creating a mix for a full band. If you have any questions of comments, please leave them below. I hope this is helpful for you.