No 

Yes- within 12 months from the date of first filing of the priority application. 

Worldwide- 

required 

1. A Power of Attorney, simply signed. Attested by two witness 
2. One copy of the English specification and claims.
3. One set of the drawings relating to the invention, if any.
4. An abstract of the invention 
5. A certified copy of the application giving the filing date, number and country if the application is to be filed with a priority claim.

7 years starting from the filing date, renewable for 2 successive terms each (total 21 years)