Immigration after 12th - From Delhi

[sabicha]

Hi all..

I'm planning to immigrate after my 12th standard which will end in April 2014..
My subjects are commerce with IP and additional maths..
I wanted to know if it is better to apply online or through a representative..?
And, when should i give my IELTS exam and what is the minimum result I'm supposed to score ?
and when should I apply ?

Please help
Thanks in advance..