Generally yes, you don't use Oxford comma in Swedish.

Sometimes you need to use the word "samt" instead of "och" of you already have an "och" in the things being enumerated.

Jag gillar Lilla Rödluvan, Hans och Greta samt Askungen.

I like Little Red Riding Hood, Hansel and Gretel, and Cinderella.

No, months and weekdays begin with small letters.

Yes, and the Roman god of war as well (which both are named from).

Yes, it sounds good. R + S melt together to form a retroflex consonant.

What do you mean by a "date"? Do you mean a specific date? ett datum 1:a april 2015 (April 1st 2015)

"Och" is pronounced as just "å" in casual speech. That's the pronunciation you'll be most likely to hear in everyday conversation.