Can someone explain whats going on in Deadwood?

[LondonBroil]

I don't get it.

1. What's Francis Wilcott's purpose in the show? Also, why did he kill those prostitutes?

2. What was Swearengan talking to Bullock about at the end of the last episode?

3. Does Bullock's brother's wife know that Bullock and Mrs. Garrett were knocking boots? Is that why she was all pissy last episode?

4. Why did that guy (forget his name) ask Mrs. Garrett to marry him? Is it because it wasn't acceptable back then to have a kid out of wedlock?

5. What is "Yankton".

6. Who is the Chinese guy with the Chinese prostitues and what role does he have in the show?

I love the show but because of the speech that's used it's sometimes hard to figure out what's being said.