Well, EQ is really song dependant.
It's kinda hard to write a tutorial on this subject.
However...I have noticed that if you go into the parametric EQ for each instrument and play around with the settings, it's a bit easier to learn. I would suggest using a decent pair of headphones when messing around with it though.
If you go into some of my tracks (such as In This World *EQ*
) you can explore it and look at what i did to bring out some Equalization in the tracks.
Now i'm a complete noob when it comes to EQ, but I feel you should just go by ear. If it sounds good to you, theoretically it should sound good to others