Please help! H1-B visa stamp in Vancouver

Hello everybody,

I am going to apply for my H1-B visa stamp in Vancouver. If anybody who has the experience can answer my questions, I would appreciate.

(1) How long do I need to wait once I make the appointment for H1-B visa application?

(2) Can I get my H1-B visa stamp on the same day of the application?
If I can't, how many days do I need to wait?

(3) What kind of documents do I need to prepare for the interview?

(4) How many months visa does Vancouver Consulate issue?

(5) I just started my green card process. Will it affect on getting H1-B visa?

(6) Will there be any difficulties in getting H1-B in Vancouver?

Thanks again.