source - i'm gonna be talking about this universe. i chose this one since this is the most different to the rest, mosaic and the others i have simply share the normal world as we do.

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1. Are women inferior to men (if so, are they not allowed to look men in the eye or speak to men without being spoken to)? Are men inferior to women? 

Neither is the case.

2. Do women woo men or do men court women? Either way, how do they go about doing it? 

Either case is possible. Cultural.

3. How do marriage proposals work? Are certain people not allowed to get married (i.e. peasants, criminals, gay people, etc)? 

Magicians can't get married, everybody else is allowed.

4. Do they marry for love, money/social status, or to strictly reproduce? 

Sometimes the later 2 options may happen between high status.

5. Are weddings big events? 

Only for rich and powerful.

6. Are certain people not allowed to speak to those of higher social status? 

Magicians and most people that don't have higher connection with the goverment.

7. Are there specific gestures one must use when talking to someone of higher/lower status (i.e. curtsy, bowing)

Never looking to their eyes, soldiers and peasants must be always be lower (stairs, or simply bowing).

8. Are people allowed to have physical contact with each other in public? Are people who aren’t married allowed to touch each other at all? 

They are.

9. Do men/women have to practice modesty while in public (i.e. hijabs for women)? At what age does this modesty begin? 

In certains countries it's prohibited to follow most middle-east religions, in some others, it's only cultural/your decision.

10. Are certain gestures unacceptable (like the middle finger in America)?

Whichever rude one towards high class, whatever puts you off being lower, is your problem.

11. Are there vulgarities or swear words? If so, are certain people not allowed to use them? Are there laws against certain words, and what are the consequences if these laws are broken? 

You can't and shouldn't speak about magicians or be agaisn't their dead, you can't teach about them in schools.

12.  Are men/women limited to a certain role? For example, women might be confined to housekeeping and caring for children. (I don’t suggest you use this in your story, though, since it’s cliche and kind of offensive. That is, unless something happens in your story where all the women are totally badass and they revolt against the men.)

None.

13. What do they value in life? It can be money, status, liquor, fun, sex, power, serenity, etc. 

Status and power.

14. How do siblings interact? Is one sibling more important than the other based on age? Does the older sibling assume more responsibility? (Is incest socially acceptable?)

Incest is your bussines, no one cares, or no one won't say shit if you're high class. Anything else is cultural.

15. How do parents interact? Are they distant or warm? Do they see each other as equals or is one better than the other? Do parents support children or do children have to fend for themselves after a certain age? 

It varies like in the real world, but let's say that role model ones are distant, since you don't know when they're gonna die; unless you're high class, then the asshole that turns is up to them.

16. Are elders and babies/children respected or ridiculed? 

If you're not high class, you're not respected, at least they won't; between peasants, people try to respect each other equally.

17. In many Caribbean islands, children refer to their grandmothers as ‘mother’, or mama, mommy, etc. In Guyanese culture, the English word for the woman who gives birth to a child is ‘auntie’. Maybe there’s something like that in your society. 

Nothing I can think of, but those things might still exist on this world, if these cultures didn't die off.