Here is the fact sheet about the Essentila Skills visa. Click on
Show all evidence, and it will display what is needed, so you can judge if you think you have enough to meet the requirements.
For work experience to be credited, INZ requires something from each employer that gives the start date, the end date, the rate of pay, the normal working hours, and a description of your duties. Each of those points needs to be covered, or it can't count. It will help if you can also show your bank and/or tax records of the time.