fsw query

I am applying for pr canada without the use of consultant since they r charging alot of money . I have read the details about documents on cic site.had some query and want to share with u all.
1. Is birth certificate compulsary ? can a secondary school certificate (10 or 10+2)indicating date of birth will do in its place.
2.can u tell about original transcripts in university sealed envelopes? are degree certificates not sufficient.Transcripts for spouse is also necessary or only diploma d=certificates will do.
3.only experience letter will do from previous and current employer or appointment letter is also to be given.I donot have the appointment letter.

KIndly persons from india specially who have applied help me out.