Hi Sreedivya,
Go through CIC website instructions and there are so many who write on the same in Quora. That would be helpful. Collect all the information and then start the process.
Once you have the score above 6 in IELTS you can create your profile but better to do it with CLB9. Please note you need bare minimum CLB 9 to get an ITA these days in Federal Skilled category which is the easiest or else above 400 for PNP. CLB 9 - L 8, R 7, W 7, S 7.
In the meanwhile you can get your ECA also done from WES Canada - ask your parent institutions from all the places/ countries you studied to post the attested documents directly to WES Canada in a sealed envelope. This process can take a while depending upon your educational institution turnaround time. WES Canada approximately takes a month. (If you do and keep this then half your worry would be gone by the time you get your ITA.)
Also try and maintain a good bank balance consistently while you plan these things. Sudden transactions are not advisable hence do maintain funds in advance.
Then once you receive ITA get all the documents like work letters and salary slips for 6 months for better transparency, bank letter and bank statement for 6 months for better transparency, travels done out of the country for last 10 years even including the transit areas - port of departure, arrival with dates for both, PCC for all the countries you have lived for more than 6 months in last 10 years, also if there is any gap in study or employment do mention it tell that you were staying with family at home. Also give the list and details of addresses that you have lived in past 10 years. Never leave any gaps in dates - be it study, employment or addresses, if there is a gap mention that in explanation. Any information that CIC needs to know mention that in the explanation letter. Advisable to have your latest job roles mentioned in the work letter to ensure that it matches with the category in which you have applied. Scanned copy of all the pages of all the passports you have held (I think you should give all passports not sure about it though.).
I think this is it and you are good to go. Then your usual photos and things as specified in CIC website. Good luck.