Hi, I am an Indian Passport Holder and currently working in japan. I have a resident register card

Hi, I am planning to visit shangai in december 2012 to meet my sister

I would like to ask couple of questions
a) When should i apply for chinese visa if travel is december 2012?
b) Will i be applying as Tourist Visa ?
c) I stay in Toyota City, Aichi, Can i apply in Nagoya?
d) WHat are the documents needed ?
e) how much time for processing
f) will a travel agent do this? do i also need to book tickets to process visa
g) do i need a re entry permit to japan (i have resident register card same as alien card)
e)