Hi,
i am also in the process of applying.. gathering info.. to the best of my knowledge here are the answers..
Ans -1) no speicific month/date
Ans-2) Its not mandatory to go thru a consultancy.. the rule says u can also do it on ur owny.
Ans-3) pls go thru it--it helps u..
http://www.canadavisa.com/canada-immigration-discussion-board/common-questions-t13225.0.htmlAns-4) in general everyone is saying it takes approx 12 mnths to get ur visa.
all the best..