Cananda: document preparation?

Please help me with following questions when applying Canada Immigration:
1. I made "Notory of no criminal record" in China years ago before came to America, qustion is: can I use that this notory, or have to re-do it since the guide line requests record WITHIN 3 MONTHS?

2. Do I have to notorize all the Working expereince particularlly gained in China, providing I am not really depend on those experiences as I already worked more than 4 years in USA?

3.Do I need to notorize all the degrees/deploma gained in China and USA? providing I can providing originally sealed and stamped degree/deploma copies provided by University?

Thanks ALOT!