dv lottery 2010 interview question, urgent

[bismah]

hi, me and my wife won the dv lottery 2010 and received letter for interview. i am little bit confuse about the required document. right now i am in austraila being citizenship of eligiable country.

we have taken appointment for medical, police certificate from aus. but have to translate our doc from our language to english like birth certificate, marriage certificate. but i am not sure where can i find translation office and is it valid..

my questions are::
*** i have translated doc done 1 year before when i apply visa for austraila, and doubt about is it valid till now?
*** i have sponsor from us parmanent resident, but do i still show my bank statement? if yes how much amount should i need to show?
*** do i need job offer letter from us?
*** do i need court record, militrary ?

thankyou who ever answer my questions...and if possible please five some hint about question that may ask in interview///