I'm not sure how you would do such a tutorial. Either you process inside Superior Drummer, then Toontrack's Preset packs by world class engineers can be a good guidance - or you route multiple channels from SD into your DAW and use other plugins for the processing.
But since we all use different DAWs and many have loads of third party plugins they consider essential (like some 1176 for the snare), the processing in the DAW will turn out very differently depending on what you use outside SD.
So, the only common ground is what's inside SD then. And like I said, see what professionals did while struggling with SD's internal FX to achieve good results by going through presets. Those often don't sound natural in any way, because they're processed to fit into a specific genre and work with a typical pricessed arrangement in that genre. But that would be a sound to imitate then, I guess.
Now, that being said, any help in finding the most common mixing mistakes should help with your intial request. The 'typical sound' for different genres exists for good reason - a metal drum sound doesn't blend well with acoustic guitars and a Piano. A more general tutorial about how to mix so that instruments sound like they actually belong, that would be great!
And then, as you mentioned, preferences for different genres from the SD expansions should be mentioned and demonstrated. But also show how to achieve similar results with the factory library.