OINP is primarily a multi-step process.
1st Step = Create EE profile with 400+ CRS (Make sure to chose Ontario or All provinces in the Which "Provinces and territories would you consider living in" option in the EE profile)
2nd Step = Receive NOI
3rd Step = Accept NOI and Register on ONe Portal.
4th Step = Once registered, you have 45 calendar days (from the date NOI received) to submit your application to the OINP under the Human Capital Priorities Stream. If the deadline to submit the application falls on a weekend or a statutory holiday, the deadline to submit the application will be extended to the next working (business) day. When submitting you will be asked to make a payment of $1500.
5th Step = Wait for the nomination. Once received, accept it within 30 days.
6th and Final Step = Receive ITA.
There are quite a few changes in the requirements of OINP and they are all mentioned in the updated application guide. Please refer to it carefully. OINP has become very strict in their process and applies all its requirements to the fees, So please prepare your documentation accordingly.Here is the link to the application guide:
http://www.ontarioimmigration.ca/prodconsum/groups/csc/@oipp/documents/document/oi_en_hcps_010517.pdf