National Occupational Classification (NOC) lists out all skill levels and sets out the criteria necessary to complete the application. You can find your NOC at HERE
The filing process for permanent residence through the Canadian Experience Class begins with the obtaining of all documentation and information needed to create your Express Entry profile. Once you have all your evidence and information you can create and submit your profile. Thereafter you have to wait for an Invitation to Apply for permanent residence, which is generated based on your score and rank in the Express Entry pool using the Comprehensive Ranking System. https://www.canada.ca/en/immigration-refugees-citizenship/services/immigrate-canada/express-entry/submit-profile.html