What seems to be missing is an overview of somebodies workflow
i think the problem here is that there really isn't "a" workflow. just like there is no "a good setting", every song requires it's own touch... its own gain settings, EQ (or not), compression (or not), etc
that's where the artform comes in .. listening to each song and realizing what it needs. that's something that's not easy to do via text (and as i've posted many times, it can take years of experience to be good, that's why a good mastering engineer can command hundreds of dollars _per hour_ for their work)
my suggestion: read up on compression, eq, even search for "mixing and mastering". if you can learn the tools, GB itself doesn't really come into the equation, it's just a workbench upon which you can use the tools it provides. learn the tools, don't worry about GB.