Hi Venkatesh,
You would need PCC for every country you stayed for more than 6 months, If you are including your spouse - you will need PCC for her as well.
For ITA , you dont need PCC but post ITA you would need, you can start the process now so that by the time you get ITA you will have everything ready.
You can check this thread , it is a wiki for most of the common questions.
Regards,
Kapil Chandra