One has to complete an EOI (expression of interest), in this EOI you can claim points for age, skilled employment, work experience, qualifications etc. your total points will help you to determine whether to submit your EOI for the selection process. At this stage, documentation is not a mandate
If your EOI is shortlisted from the EOI pool, the government has to decide whether they will invite you to apply for residence in New Zealand; based on the points you have claimed.
The general time taken for processing the application of EOI is 8-12 weeks, The ITA contains a set of mandate rules and a list of documents that will be needed to be submitted to the nearest office.
Once the residence application with documents is submitted, an immigration officer will assess and decide if residence will be granted. They will communicate further if information is required.
The time taken for processing is 6-9 months
You will be required to submit your resident application within six months on the form which is in turn provided to you by the government. If it turns out to be successful, you will be issued either the resident visa or the job search New Zealand visa. Or bonus points will be compensated for work experience in an area of absolute skill shortage.