How to get work permit in Canada?

Please check the following links:

https://movnorth.com/faq/

Also check which NOC code applies to your husband https://www.canada.ca/en/immigration-refugees-citizenship/services/immigrate-canada/express-entry/become-candidate/eligibility/find-national-occupation-code.html#find

Canadian express entry is dependent on age, education, work experience, and the demand for your profession in Canada. If you clear a certain threshold you can apply for PR. In that respect either one can be the primary applicant.