Little confusion in mailing address of CIC: Case- Regular Mail and by Courier

[shrinivas1980]

Dear Experts

Now, I need to send my application to CIC. They have mentioned address too. However, I am little confused about where to send the application package.

Please visit the link below (step 4)

http://www.cic.gc.ca/english/information/applications/guides/EG7TOC.asp#pay-fee.

In this link they have mentioned that I can send the application package either by 'regular mail' or 'by courier'. In both the cases, addresses are little different. I am planning to send 'by courier' so should I send my application on following address?

Citizenship and Immigration Canada
Federal Skilled Worker
NOC Category, Offer of Arranged Employment category or PhD category
Primary NOC 2011 Code: XXXX
49 Dorchester Street
Sydney, NS
B1P 5Z2
Canada

Also, I am planning to apply for myself, my wife and my son (10 months old). So, should I send only one Demand Draft including the total amount? (e.g. CAD $ 550+550+150= CAD$ 1250).

Your help is much needed.

Thank you.

Sincerely,

Shrinivas