Hello All,
I'm trying to figure out how to calculate DC, as from what I've read this particular roll becomes super important later on in the game.

Here is what I assume:

Spell DC = 10 + relevant ability mod [here CHA]+ spell level [here influenced by heighten]+ Spell Focus feats [both stack] + item [only highest bonus counts, different items stack in no way].

So, I'm not sure how to figure the ability mod part.

I'm a level 7 with 22 CHA (+6 Mod). Does that mean:

10 + 22 + spell level + focus + item

Or:
10 + 6 + spell level + focus + item


Finally, then, are the enhancements that directly increase charisma the only ones that will have an impact on DC?

Thanks,
Pros